Financial and other investments (Tables) |
12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Mar. 31, 2024 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Disclosure of financial assets [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of financial assets |
1.The collateral balance includes £466 million (2023: £734 million) of collateral placed with counterparties with whom we have entered into a credit support annex to the International Swaps and Derivatives Association (ISDA) Master Agreement, £24 million (2023: £25 million) of restricted amounts allocated for specific projects within National Grid Electricity System Operator and National Grid Electricity Transmission plc and £6 million (2023: £5 million) insurance captive letters of credit.
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