|  | 02 Aug 2018- Prospectus dated 2 August 2018 | 
          
                                                                                        |  | 30 Jul 2019 - Prospectus dated 30 July 2019 | 
          
                                                                                        |  | 02 Aug 2011- Prospectus dated 2 August 2011 | 
          
                                                                                        |  | 17 Dec 2009- National Grid Electricity Transmission plc - Articles of Association 2009 | 
          
                                                                                        |  | Annual Report and Accounts 2018/19 - Interactive | 
          
                                                                                        |  | Annual Report and Accounts 2018/19 - 20-F | 
          
                                                                                        |  | Annual Report and Accounts 2018/19 - Form 20-F XBRL data files | 
          
                                                                                        |  | Notice of 2019 Annual General Meeting - PDF | 
          
                                                                                        |  | Annual Report and Accounts 2017/18 - 20-F | 
          
                                                                                        |  | Annual Report and Accounts 2017/18 - PDF | 
          
                                                                                        |  | Annual Report and Accounts 2017/18 - Interactive | 
          
                                                                                        |  | Annual Report and Accounts 2017/18 - Form 20-F XBRL data files | 
          
                                                                                        |  | Notice of 2018 Annual General Meeting - PDF | 
          
                                                                                        |  | 21 Aug 2025 - Trust Deed dated 21 August 2025 | 
          
                                                                                        |  | 21 Aug 2025 - Prospectus dated 21 August 2025 | 
          
                                                                                        |  | 21 Dec 2017- Prospectus dated 21 December 2017 | 
          
                                                                                        |  | Annual Report and Accounts 2016/17 - PDF | 
          
                                                                                        |  | Annual Report and Accounts 2016/17 - Interactive | 
          
                                                                                        |  | Annual Report and Accounts 2016/17 - 20-F | 
          
                                                                                        |  | Notice of 2017 Annual General Meeting - PDF |