LONDON–(BUSINESS WIRE)– As Agent Bank, please be advised of the following rate determined on: 10/1/2026 Issue ¦ National Grid Gas plc – Series 43 GBP 300,000,000 Index Linked FRN Due 17 Oct 2036 ISIN Number ¦ XS0270621138 ISIN Reference ¦ 27062113 Issue Nomin GBP ¦ 140000000 Period ¦ 4/17/2026 to 10/17/2026 Payment Date 10/19/2026 Number of Days ¦ 183 Rate ¦ 3.707934 Denomination GBP ¦ 1000 ¦ 140000000 ¦ Amount Payable per Denomination ¦ 18.54 ¦ 2595554.09 ¦ Bank