|  | 08 Dec 2016- Sale of UK Gas Distribution - Webcast Transcript | 
          
                                                                                        |  | 15 Jun 2016- Oddo Securities Environment Conference | 
          
                                                                                        |  | 01 Feb 2016- HSBC SRI Conference | 
          
                                                                                        |  | 01 Feb 2016- HSBC SRI Conference - sustainability in detail | 
          
                                                                                        |  | 01 Jul 2015- FTSE 100 Conference, London (Intro to National Grid) | 
          
                                                                                        |  | 11 Jun 2015- Oddo Environment Forum, Paris (SRI) | 
          
                                                                                        |  | 04 Feb 2015- HSBC SRI Conference, Frankfurt | 
          
                                                                                        |  | 15 Jan 2015- UK interconnector development | 
          
                                                                                        |  | Annual Report and Accounts 2019/20 - PDF | 
          
                                                                                        |  | Annual Report and Accounts 2019/20 - Interactive | 
          
                                                                                        |  | Annual Report and Accounts 2019/20 - 20-F | 
          
                                                                                        |  | Annual Report and Accounts 2019/20 - Form 20-F XBRL data files | 
          
                                                                                        |  | Notice of 2020 Annual General Meeting - PDF | 
          
                                                                                        |  | Annual Report and Accounts 2018/19 - PDF | 
          
                                                                                        |  | 16 Dec 2020- Supplementary Prospectus dated 16 December 2020 | 
          
                                                                                        |  | 12 Nov 2020- Supplementary Prospectus dated 12 November 2020 | 
          
                                                                                        |  | 09 Sep 2020- Supplementary Prospectus dated 9 September 2020 | 
          
                                                                                        |  | 07 Aug 2020- Prospectus dated 7 August 2020 | 
          
                                                                                        |  | 07 Apr 2020- Supplementary Prospectus dated 7 April 2020 | 
          
                                                                                        |  | 21 Nov 2019- Supplementary Prospectus dated 21 November 2019 |