TIDMNG. TIDM35DT TIDM46QK TIDM87QJ TIDM71GP

RNS Number : 9123J

National Grid PLC

06 July 2011

6 July 2011

National Grid plc ('National Grid' or 'NGplc')

and

National Grid Gas plc (NGG)

National Grid Electricity Transmission plc (NGET)

NGG Finance plc (NGGF)

National Grid USA (NGUSA)

British Transco International Finance BV (BTIF)

Annual Information Update for the 2010/11 financial year and information up to and including 22 June 2011

This Annual Information Update is issued following the publication of the National Grid Annual Report and Accounts 2010/11 and contains information in respect of National Grid and the group entities headlined above as specified in this document.

It is required by and being made pursuant to Prospectus Rule 5.2 and Article 10 of the Prospectus Directive as implemented in the United Kingdom and not for any other purpose and neither the Company, nor any other person, takes responsibility for, or makes any representation, express or implied, as to the accuracy or completeness of, the information which it contains. This information is not necessarily up to date at the date of this annual information update and the issuing Companies do not undertake any obligation to update any such information in the future. Furthermore such information may have been prepared in accordance with the laws or regulations of a particular jurisdiction and may not comply with or meet the relevant standards of disclosure in any other jurisdiction. This annual information update does not constitute an offer of any securities addressed to any person and should not be relied upon by any person.

Section A:

Announcements to the London Stock Exchange by National Grid plc and/or by other companies headlined, as indicated:

DATE DETAILS

 
 15.6.11        Directors' share interests- Deferred Share Plan - 2008 
                 Award released and 2011 Award 
-------------  --------------------------------------------------------------- 
 14.6.11        Voting rights and capital (transfer of shares from 
                 treasury) 
-------------  --------------------------------------------------------------- 
 13.6.11        Publication of Annual Report and Accounts and Notice 
                 of AGM 2011 
-------------  --------------------------------------------------------------- 
 8.6.11         Scrip Dividend for 2010/11 Final Dividend 
-------------  --------------------------------------------------------------- 
 7.6.11         Directors Interests-Share Incentive Plan-monthly update 
-------------  --------------------------------------------------------------- 
 3.6.11         Voting rights and capital (transfer of shares from 
                 treasury) 
-------------  --------------------------------------------------------------- 
 1.6.11         Voting rights and capital (end May issued share capital 
                 confirmed) 
-------------  --------------------------------------------------------------- 
 24.5.11        Voting rights and capital (transfer of shares from 
                 treasury) 
-------------  --------------------------------------------------------------- 
 20.5.11        NGUSA Supplementary Prospectus-4Bn Euro Medium Term 
                 Note Programme dated 20.12.2010 
-------------  --------------------------------------------------------------- 
 19.5.11        Results for the year ended 31 March 2011 (Also sent 
                 out in names of NGUSA, NGG, NGET, NGGF) 
-------------  --------------------------------------------------------------- 
 13.5.11        NGET Debt repurchase: GBP46.615m of GBP75m 5% instruments 
                 due March35' for cancellation 
-------------  --------------------------------------------------------------- 
 9.5.11         Directors Interests-Share Incentive Plan-monthly update 
-------------  --------------------------------------------------------------- 
 9.5.11         Voting rights and capital (transfer of shares from 
                 treasury) 
-------------  --------------------------------------------------------------- 
 5.5.11         Voting rights and capital (transfer of shares from 
                 treasury) 
-------------  --------------------------------------------------------------- 
 3.5.11         Voting rights and capital (end April issued share capital 
                 confirmed) 
-------------  --------------------------------------------------------------- 
 27.4.11        Voting rights and capital (transfer of shares from 
                 treasury) 
-------------  --------------------------------------------------------------- 
 13.4.11        Notification of Major Interests in Shares - Norges 
                 Bank 2.99% 
-------------  --------------------------------------------------------------- 
 12.4.11        Voting rights and capital (transfer of shares from 
                 treasury) 
-------------  --------------------------------------------------------------- 
 8.4.11         Directors Interests-Share Incentive Plan-monthly update 
-------------  --------------------------------------------------------------- 
 7.4.11         Conclusion of independent review of US cost allocation 
-------------  --------------------------------------------------------------- 
 6.4.11         Notification of Major Interests in Shares - Norges 
                 Bank 3.01% 
-------------  --------------------------------------------------------------- 
 6.4.11         Performance Share Plan - Lapse of Awards 
-------------  --------------------------------------------------------------- 
 4.4.11         Voting rights and capital (transfer of shares from 
                 treasury) 
-------------  --------------------------------------------------------------- 
 1.4.11         Voting rights and capital (end March issued share capital 
                 confirmed) 
-------------  --------------------------------------------------------------- 
 25.3.11        NGG Debt Repurchase GBP13.5m of GBP275m 8.75% Instruments 
                 due 2025 for cancellation 
-------------  --------------------------------------------------------------- 
 16.3.11        Notification of Major Interests in Shares - Blackrock 
                 above 5% 
-------------  --------------------------------------------------------------- 
 15.3.11        NGUSA Final Terms re issue of $30m Floating Rate Instruments 
                 due 2014 under NGUSA Euro 4BN EMTN- published on RNS 
                 website. 
-------------  --------------------------------------------------------------- 
 14.3.11        Voting rights and capital (transfer of shares from 
                 treasury) 
-------------  --------------------------------------------------------------- 
 8.3.11         Directors Interests-Share Incentive Plan-monthly update 
-------------  --------------------------------------------------------------- 
 4.3.11         Blocklisting Interim Review 
-------------  --------------------------------------------------------------- 
 3.3.11         Notification of Major Interests in Shares - Norges 
                 Bank 2.98% 
-------------  --------------------------------------------------------------- 
 1.3.11         Voting rights and capital (end February issued share 
                 capital confirmed plus transfer of shares from treasury) 
-------------  --------------------------------------------------------------- 
 17.2.11        Notification of Major Interests in Shares - Capital 
                 Group 5.0378% 
-------------  --------------------------------------------------------------- 
 14.2.11        Voting rights and capital (transfer of shares from 
                 treasury) 
-------------  --------------------------------------------------------------- 
 7.2.11         Voting rights and capital (transfer of shares from 
                 treasury) 
-------------  --------------------------------------------------------------- 
 7.2.11         Directors Interests-Share Incentive Plan-monthly update 
-------------  --------------------------------------------------------------- 
 2.2.11         Director's share purchase (Sir John Parker) 
-------------  --------------------------------------------------------------- 
 1.2.11         Voting rights and capital (end January issued share 
                 capital confirmed plus transfer of shares from treasury) 
-------------  --------------------------------------------------------------- 
 31.1.11        National Grid plc Change of Executive Directors' 
                Responsibilities, Restructuring and $200m US Efficiency 
                Programme (Mark Fairbairn) 
-------------  --------------------------------------------------------------- 
 31.1.11        National Grid plc Interim Management Statement for 
                 the period 1 October 2010 to 30 January 2011 
-------------  --------------------------------------------------------------- 
 25.1.11        Notification of Major Interests in Shares - Norges 
                 Bank 3% 
-------------  --------------------------------------------------------------- 
 24.1.11        Notification of Major Interests in Shares - Deutsche 
                 Bank AG reduces to under 3% 
-------------  --------------------------------------------------------------- 
 24.1.11        Cancellation of Notes Purchased Pursuant to Cash Tender 
                 Offers {also released in name of NGG} 
-------------  --------------------------------------------------------------- 
 21.1.11        Decision on Niagara Mohawk Electric Rate Case 
-------------  --------------------------------------------------------------- 
 20.1.11        Notification of Directors' Interests -Scrip Dividend 
                 participants 
-------------  --------------------------------------------------------------- 
 19.1.11        Voting rights and capital (Scrip Issue - interim dividend) 
-------------  --------------------------------------------------------------- 
 19.1.11        Notification of Major Interests in Shares - Deutsche 
                 Bank AG reduces to 4.92% 
-------------  --------------------------------------------------------------- 
 18.1.11        Voting rights and capital (transfer of shares from 
                 treasury) 
-------------  --------------------------------------------------------------- 
 18.1.11        National Grid plc Scrip Dividend (issue and allotment 
                 by NG plc) 
-------------  --------------------------------------------------------------- 
 18.1.11        Final Pricing of Cash Tender Offers {also released 
                 in names of NGET and NGG} (Not distributed in US and 
                 certain other territories) 
-------------  --------------------------------------------------------------- 
 18.1.11        Offer Results of Cash Tender Offers {also released 
                 in names of NGET and NGG} (Not distributed in US and 
                 certain other territories) 
-------------  --------------------------------------------------------------- 
 14.1.11        Notification of Major Interests in Shares - Deutsche 
                 Bank AG at 5.43% 
-------------  --------------------------------------------------------------- 
 12.1.11        NGUSA Final Terms re issue of $50m Floating Rate Instruments 
                 due 2016 under NGUSA Euro 4BN EMTN- published on RNS 
                 website. 
-------------  --------------------------------------------------------------- 
 10.1.11        Launch Cash Tender Offers {also released in names of 
                 NGET and NGG} 
                 (Not distributed in US and certain other territories) 
-------------  --------------------------------------------------------------- 
 10.1.11        Directors Interests-Share Incentive Plan-monthly update 
-------------  --------------------------------------------------------------- 
 05.1.11        Voting rights and capital (transfer of shares from 
                 treasury) 
-------------  --------------------------------------------------------------- 
 04.1.11        Voting rights and capital (end December 2010 issued 
                 capital confirmed) 
-------------  --------------------------------------------------------------- 
 30.12.10       Sharesave Scheme - Grant of options- A Bonfield 
-------------  --------------------------------------------------------------- 
 29.12.10       Notification of Major Interests in Shares - Invesco 
                 Ltd 
-------------  --------------------------------------------------------------- 
 21.10.10       NGG Debt Repurchase: GBP17.915 million of the GBP200 
                 million 7.125% Bonds due Feb. 2044 for cancellation 
-------------  --------------------------------------------------------------- 
 20.12.10       NGUSA Prospectus for 4Bn EUR EMTN 
-------------  --------------------------------------------------------------- 
 13.12.10       Voting rights and capital (transfer of shares from 
                 treasury) 
-------------  --------------------------------------------------------------- 
 9.12.10        Sale of Granite State Electric and EnergyNorth 
-------------  --------------------------------------------------------------- 
 8.12.10        Optional Scrip Dividend for 2010/11 Interim dividend 
-------------  --------------------------------------------------------------- 
 7.12.10        Directors Interests-Share Incentive Plan-monthly update 
-------------  --------------------------------------------------------------- 
 3.12.10        Voting rights and capital (transfer of shares from 
                 treasury) 
-------------  --------------------------------------------------------------- 
 2.12.10        NGUSA Final Terms. Issue of USD 500m Floating Rate 
                 Instruments due 2013 under NGUSA Euro 4BN EMTN-published 
                 on RNS website 
-------------  --------------------------------------------------------------- 
 2.12.10        Directors' Interests in Shares (Tom King) 
-------------  --------------------------------------------------------------- 
 1.12.10        Directors Interests- Performance Share Plan (Grant 
                 to A Bonfield) 
-------------  --------------------------------------------------------------- 
 1.12.10        Voting rights and capital (end November issued capital 
                 confirmed) 
-------------  --------------------------------------------------------------- 
 30.11.10       Directors Interests- Special Retention Award Plan (Tom 
                 King- ADR- final net release) 
-------------  --------------------------------------------------------------- 
 25.11.10       NGUSA Supplementary Prospectus to USA 4Bn EUR EMT Term 
                 Note Programme dated 18 Dec09; incorporating Annual 
                 Report for year ended 31 March10 
-------------  --------------------------------------------------------------- 
 24.11.10       NGUSA Final Terms. Issue of EUR 20m Floating Rate Instruments 
                 due 2012 under NGUSA Euro 4BN EMTN-published on RNS 
                 website 
-------------  --------------------------------------------------------------- 
 18.11.10       Half year report for the six months ended 30 September 
                 2010 (unaudited) Also sent out in names of NGUSA, NGG, 
                 NGET, NGGF 
-------------  --------------------------------------------------------------- 
 16.11.10       Voting rights and capital (transfer of shares from 
                 treasury) 
-------------  --------------------------------------------------------------- 
 10.11.10       Voting rights and capital (transfer of shares from 
                 treasury) 
-------------  --------------------------------------------------------------- 
 8.11.10        Directors Interests-Share Incentive Plan-monthly update 
-------------  --------------------------------------------------------------- 
 3.11.10        Decision on Massachusetts Gas Rate Case 
-------------  --------------------------------------------------------------- 
 1.11.10        Voting rights and capital (end October issued capital 
                 confirmed plus transfer of shares from Treasury) 
-------------  --------------------------------------------------------------- 
 26.10.10       Publication of Annual Reports and Accounts -Group Companies 
                 With Listed Debt- separately sent for one related co- 
                 NGUSA 
-------------  --------------------------------------------------------------- 
 25.10.10       Blocklisting Interim Review 
-------------  --------------------------------------------------------------- 
 21.10.10       NGG Debt Repurchase: GBP22.28 million of the GBP300 
                 million 6 % Instruments due June 2017 for cancellation 
-------------  --------------------------------------------------------------- 
 20.10.10       NGG Debt Repurchase: GBP10.05 million of the GBP484 
                 million 6.375 % Instruments due March 2020 for cancellation]. 
-------------  --------------------------------------------------------------- 
 18.10.10       Voting rights and capital (transfer of shares from 
                 Treasury) 
-------------  --------------------------------------------------------------- 
 7.10.10        Directors Interests-Share Incentive Plan-monthly update 
-------------  --------------------------------------------------------------- 
 5.10.10        Voting rights and capital (transfer of shares from 
                 Treasury on 4 October) 
-------------  --------------------------------------------------------------- 
 4.10.10        National Grid Finance Director Appointment 
-------------  --------------------------------------------------------------- 
 1.10.10        Voting Rights and Capital (end September issued capital 
                 confirmed) 
-------------  --------------------------------------------------------------- 
 1.10.10        Appointment of Joint Corporate Brokers (Bank of America 
                 Merrill Lynch/Barclays Capital) 
-------------  --------------------------------------------------------------- 
 24.9.10        Two separate NGplc Debt repurchases for cancellation: 
                 -GBP17.5 million of the 5.50 per cent. Instruments 
                 due July 2013; 
                 -AND GBP13.6 million of the 5.25 per cent. Instruments 
                 due June 2011. 
-------------  --------------------------------------------------------------- 
 21.9.10        Voting rights and capital (transfer of shares from 
                 Treasury) 
-------------  --------------------------------------------------------------- 
 8.9.10         Directors Interests-Share Incentive Plan-monthly update 
-------------  --------------------------------------------------------------- 
 8.9.10         NGG Debt Repurchase. GBP 4.275 million of the GBP503.078 
                 million 7% Fixed Rate Bonds due 16 Dec 2024 for cancellation 
-------------  --------------------------------------------------------------- 
 7.9.10         NGG Debt Repurchase. GBP47.593 million of the GBP503.078 
                 million 7% Fixed Rate Bonds due 16 Dec 2024 for cancellation 
-------------  --------------------------------------------------------------- 
 1.9.10         Voting Rights and Capital (end August issued capital 
                 confirmed) 
-------------  --------------------------------------------------------------- 
 31.08.10       Notification of Major Interests - Blackrock under 5% 
-------------  --------------------------------------------------------------- 
 23.8.10        Voting rights and capital (transfer of shares from 
                 Treasury) 
-------------  --------------------------------------------------------------- 
 19.8.10        Notification of Directors' Interests -Scrip Dividend 
                 and Dividend Reinvestment 
-------------  --------------------------------------------------------------- 
 19.8.10        NG plc debt repurchase 
-------------  --------------------------------------------------------------- 
 18.8.10        National Grid plc Scrip Dividend (issue and allotment 
                 by NG plc) 
-------------  --------------------------------------------------------------- 
 17.8.10        Director Share Purchase- John Allan 
-------------  --------------------------------------------------------------- 
 10.8.10        Directors Interests-Share Incentive Plan-monthly update 
-------------  --------------------------------------------------------------- 
 9.8.10         Voting Rights and Capital (Transfer of shares from 
                 Treasury) 
-------------  --------------------------------------------------------------- 
 3.8.10         National Grid plc and NGGF Cancellation of Notes Purchased- 
                 Cash Tender Offers 
-------------  --------------------------------------------------------------- 
 2.8.10         Voting Rights and Capital (end July issued capital 
                 confirmed) 
-------------  --------------------------------------------------------------- 
 29.7.10        National Grid plc and NGGF- Final Pricing of the Fixed 
                 Rate Notes (Not distributed in US and certain other 
                 territories) 
-------------  --------------------------------------------------------------- 
 29.7.10        National Grid plc and NGGF Results of Cash Tender Offers 
                 (Not distributed in US and certain other territories) 
-------------  --------------------------------------------------------------- 
 28.7.10        NGG Final terms release: NGG issue of GBP 50m Index-Linked 
                 Instruments due July 2041 under NGG/NGGFno1 Euro 10BN 
                 EMTN published on RNS website 
-------------  --------------------------------------------------------------- 
 27.7.10        Voting Rights and Capital (Transfer of shares from 
                 Treasury) 
-------------  --------------------------------------------------------------- 
 27.7.10        National Grid plc - AGM Poll Results 
-------------  --------------------------------------------------------------- 
 26.7.10        NGplc and NGET Publication of prospectus for EMTN Programme 
-------------  --------------------------------------------------------------- 
 26.7.10        National Grid plc - Interim Management Statement for 
                 the period 1 April 2010 to 25 July 2010 
-------------  --------------------------------------------------------------- 
 22.7.10        NGET Debt Repurchase: GBP10.84m of GBP250m 4.75% Instruments 
                 due 2010 
-------------  --------------------------------------------------------------- 
 22.7.10        NGG Debt Repurchase: GBP15.25m of GBP275m 8.75% Instruments 
                 due 2025 
-------------  --------------------------------------------------------------- 
 21.7.10        NGplc and NGGF Launch Cash Tender Offers (Not distributed 
                 in US and certain other territories) 
-------------  --------------------------------------------------------------- 
 19.7.10        Notification of Major Interests - Legal and General 
                 3.99% 
-------------  --------------------------------------------------------------- 
 16.7.10        Crescent Holdings Gmbh continuing interest at above 
                 4% 
-------------  --------------------------------------------------------------- 
 13.7.10        NG plc Debt Repurchase (CAD $25.255m of CAD $200m 4.98% 
                 Instruments due 2011) 
-------------  --------------------------------------------------------------- 
 13.7.10        Voting Rights and Capital (Transfer of shares from 
                 Treasury) 
-------------  --------------------------------------------------------------- 
 8.7.10         Directors Interests-Share Incentive Plan-monthly update 
-------------  --------------------------------------------------------------- 
 2.7.10         Voting Rights and Capital (end June issued capital 
                 confirmed) 
-------------  --------------------------------------------------------------- 
 30.6.10        NG plc Debt Repurchase (GBP10.816m of GBP223.194m 5.25 
                 % instruments due June 11) 
-------------  --------------------------------------------------------------- 
 30.6.10        Directors Interests- Performance Share Plan 
-------------  --------------------------------------------------------------- 
 28.6.10        Voting Rights and Capital (Transfer of shares from 
                 Treasury) 
-------------  --------------------------------------------------------------- 
 22.6.10        Annual Information update 
-------------  --------------------------------------------------------------- 
 22.6.10        NGplc Debt Repurchase: GBP26.441m 5.5% Instruments 
                 due July 2013 
-------------  --------------------------------------------------------------- 
 18.6.10        Notification of Major interest- BlackRock back over 
                 5% 
-------------  --------------------------------------------------------------- 
 17.6.10        Deferred Share Plan 
-------------  --------------------------------------------------------------- 
 15.6.10        Voting Rights and Capital (Transfer of shares from 
                 Treasury) 
-------------  --------------------------------------------------------------- 
 14.6.10        Placement of the Rights Issue Rump (Not distributed 
                 in US and certain other territories) 
-------------  --------------------------------------------------------------- 
 14.6.10        Result of Rights Issue- 94.2% take up of new shares 
-------------  --------------------------------------------------------------- 
 14.6.10        Result of Rights Issue- 94.2% take up of new shares 
                 (Not distributed in US and certain other territories) 
-------------  --------------------------------------------------------------- 
 14.6.10        Updated Total Voting Rights and Director's Interests 
                 following National Grid plc rights issue (Not distributed 
                 in US and certain other territories). 
-------------  --------------------------------------------------------------- 
 9.6.10         Other Publications of Supplementary Prospectus - NGG: 
                 GBP10Bn Euro Medium Term Note Programme of NGG and 
                 NGGF (No 1), NGUSA: GBP4Bn Euro Medium Term Note Programme 
                 of National Grid USA 
-------------  --------------------------------------------------------------- 
 9.6.10         NGplc Supplementary Prospectus for GBP15Bn Euro Medium 
                 Term Note Programme of NG plc and NGET. 
-------------  --------------------------------------------------------------- 
 9.6.10         NGplc Debt Repurchase: GBP13.7m of GBP236.894m 5.25% 
                 Instruments due June 11. 
-------------  --------------------------------------------------------------- 
 9.6.10         Scrip Dividend for 2009/10 final dividend 
-------------  --------------------------------------------------------------- 
 8.6.10         Directors Interests-Share Incentive Plan-monthly update 
-------------  --------------------------------------------------------------- 
 4.6.10         Publication of Annual Report and Accounts and Financial 
                 Timetable 2010/11 
-------------  --------------------------------------------------------------- 
 4.6.10         Voting Rights and Capital (Transfer of shares from 
                 Treasury) 
-------------  --------------------------------------------------------------- 
 1.6.10         Voting Rights and Capital (end May issued capital confirmed) 
-------------  --------------------------------------------------------------- 
 28.5.10        NG plc Debt Repurchase: GBP10.309m of GBP247.2m 5.25%. 
                 Instruments due June 11 
-------------  --------------------------------------------------------------- 
 25.5.10        Annual Financial Report 
-------------  --------------------------------------------------------------- 
 25.5.10        Issue of Prospectus (Not distributed in US and certain 
                 other territories)- rights issue 
-------------  --------------------------------------------------------------- 
 21.5.10        NG plc Debt Repurchase: GBP24.285m of GBP271.488m 5.25%. 
                 Instruments due June 11 
-------------  --------------------------------------------------------------- 
 20.5.10        NG plc Debt Repurchase:GBP28.512m of GBP300m 5.25%. 
                 Instruments due June 11 
-------------  --------------------------------------------------------------- 
 20.5.10        Results for the year ended 31 March 2010 
-------------  --------------------------------------------------------------- 
 20.5.10        National Grid plc 2 for 5 Rights Issue to raise approximately 
                 GBP3.2bn (Global version) 
-------------  --------------------------------------------------------------- 
 20.5.10        National Grid plc 2 for 5 Rights Issue to raise approximately 
                 GBP3.2bn - (Not distributed in US and certain other 
                 territories) 
-------------  --------------------------------------------------------------- 
 18.5.10        Directors share interests- Lapse of Executive Options 
                 (Fairbairn and Winser) 
-------------  --------------------------------------------------------------- 
 11 and         Voting Rights and Capital (Transfer of shares from 
  17.5.10        Treasury) 
-------------  --------------------------------------------------------------- 
 10.5.10        Directors Interests-Share Incentive Plan-monthly update 
-------------  --------------------------------------------------------------- 
 6.5.10         Voting Rights and Capital (Transfer of shares from 
                 Treasury) 
-------------  --------------------------------------------------------------- 
 4.5.10         Voting Rights and Capital (end April issued capital 
                 confirmed) 
-------------  --------------------------------------------------------------- 
 27.4.10        Voting Rights and Capital (Transfer of shares from 
                 Treasury) 
-------------  --------------------------------------------------------------- 
 14.4.10        Voting Rights and Capital (Transfers of shares from 
  And 20.4.10    Treasury) 
-------------  --------------------------------------------------------------- 
 12.4.10        Notification of Major Interest - BlackRock reduces 
                 to 4.999% 
-------------  --------------------------------------------------------------- 
 8.4.10         Directors Interests-Share Incentive Plan-monthly update 
-------------  --------------------------------------------------------------- 
 8.4.10         Notification of Major interest- BlackRock back over 
                 5% 
-------------  --------------------------------------------------------------- 
 7.4.10         Notification of Major Interest - BlackRock reduces 
                 below 5% 
-------------  --------------------------------------------------------------- 
 6.4.10         Notification of Major Interest - Legal & General reduces 
                 below 5% 
-------------  --------------------------------------------------------------- 
 6.4.10         Voting Rights and Capital (Transfer of shares from 
                 Treasury) 
-------------  --------------------------------------------------------------- 
 1.4.10         Directors' interests- Sharesave Scheme Maturities 
-------------  --------------------------------------------------------------- 
 1.4.10         Voting Rights and Capital (Transfer of shares from 
                 Treasury- and Year end update) 
-------------  --------------------------------------------------------------- 
 

###################################################################

Section B:

Filings at UK Companies House by National Grid plc- the listed group holding entity:

During the period from 1 April 2010 to 22 June 2011, National Grid plc made the following filings:

-- Forms SH04 - Transfers of repurchased shares; from Treasury to Sharescheme participants or Trustee.

-- Forms SH01 - Allotments of shares for Scrip (18.8.10 & 19.1.11)

-- and Rights Issue (14.6.10)

-- Forms TM01 - Director resignations (31.3.11- Mark Fairbairn, 31.12.10- Steve Lucas)

-- Form AP01 - Director appointment (1.11.10- Andrew Bonfield)

-- Forms CH01 - Director changes of particulars

-- Annual Report and Accounts 2009/10 (14.7.10)

-- Annual Returns (5.4.10 and 5.4.11)

-- Filing of general meeting resolutions passed for 2010 (10.08.10)

#################################################################

Section C:

Filings with the US Securities and Exchange Commission (the 'SEC')

National Grid plc Form 6-K dated 1.7.11

National Grid plc Forms 11-K dated 29.6.11

National Grid plc Form 6-K dated 17.6.11

National Grid plc Form 6-K dated 13.6.11

National Grid plc Form 20-F dated 13.6.11 for the fiscal year ended March 31, 2011

National Grid plc Form 6-K dated 8.6.11

National Grid plc Form 6-K dated 19.5.11

National Grid plc Form 6-K dated 5.5.11

National Grid plc Form 6-K dated 7.4.11

National Grid plc Form 6-K dated 22.3.11

National Grid plc Form 6-K dated 4.2.11

National Grid plc Form SC 13G dated 2.2.11

National Grid plc Form 6-K dated 31.1.11

National Grid plc Form 6-K dated 31.1.11

National Grid plc Form 6-K dated 21.1.11

National Grid plc Form 6-K dated 19.1.11

National Grid plc Form 6-K dated 23.12.10

National Grid plc Form 6-K dated 9.12.10

National Grid plc Form 6-K dated 8.12.11

National Grid plc Form S-8 dated 19.11.10

National Grid plc Form 6-K dated 18.11.10

National Grid plc Form 6-K dated 4.1110

National Grid plc Form 6-K dated 4.10.10

National Grid plc Form 6-K dated 30.9.10

National Grid plc Form 6-K dated 23.8.10

National Grid plc Form 6-K dated 18.8.10

National Grid plc Form 6-K dated 27.7.10

National Grid plc Form 6-K dated 26.7.10

National Grid plc Form 6-K dated 16.7.10

National Grid plc Forms 11-K dated 29.6.10

National Grid plc Form 6-K dated 9.6.10

National Grid plc Form 6-K dated 4.6.10

National Grid plc Form 6-K dated 25.5.10

National Grid plc Form 20-F dated 25.5.10 for the fiscal year ended March 31, 2010

National Grid plc Form 6-K dated 20.5.10

National Grid plc Form 6-K dated 20.5.10

National Grid plc Form 6-K dated 23.4.10

#################################################################

Section D:

Documents submitted to the National Storage Mechanism (NSM) at www.Hemscott.com/nsm.do and before that the UKLA document viewing facility.

 
 13.6.11    National Grid plc Annual Report and Accounts 2010/11, 
             Notice of AGM 2011 and Performance Summary 2011 
---------  ------------------------------------------------------------ 
 26.10.10   Publication of Annual Reports and Accounts -Group Companies 
             With Listed Debt 
---------  ------------------------------------------------------------ 
 27.7.10    National Grid plc - AGM Poll Results 
---------  ------------------------------------------------------------ 
 4.6.10     National Grid plc Annual Report and Accounts 2009/10, 
             Notice of AGM 2010 and Performance Summary 2010 
---------  ------------------------------------------------------------ 
 25.5.10    Prospectus relating to the National Grid plc 2 for 
             5 Rights Issue to raise approximately GBP3.2bn 
---------  ------------------------------------------------------------ 
 

Note: Alternatively, detailed information may also be obtained from the London Stock Exchange (Section A information) or UK Companies House (Section B information) or the US Securities and Exchange Commission (Section C information) or the National Storage Mechanism (Section D information) as appropriate.

Arit Amana

Company Secretarial Assistant

020 7004 3116

This information is provided by RNS

The company news service from the London Stock Exchange

END

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