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Investments in joint ventures and associates - Disclosure of share of net assets, joint ventures and associates (Details) - GBP (£)
£ in Millions
12 Months Ended
Oct. 07, 2022
Mar. 31, 2024
Mar. 31, 2023
Disclosure of joint ventures [line items]      
Share of net assets, beginning balance   £ 1,300 £ 1,238
Exchange adjustments   (31) 72
Additions   332 197
Share of post-tax results for the year   37 171
Share of other comprehensive income of associates, net of tax   0 1
Dividends received   (167) (182)
Disposals   (1) (167)
Other movements   (50) (30)
Share of net assets, ending balance   1,420 1,300
Joint ventures      
Disclosure of joint ventures [line items]      
Share of net assets, beginning balance   1,146 961
Exchange adjustments   (28) 52
Additions   319 157
Share of post-tax results for the year   28 162
Share of other comprehensive income of associates, net of tax   0 0
Dividends received   (152) (152)
Disposals   0 0
Other movements   (51) (34)
Share of net assets, ending balance   1,262 1,146
Associates      
Disclosure of joint ventures [line items]      
Share of net assets, beginning balance   154 277
Exchange adjustments   (3) 20
Additions   13 40
Share of post-tax results for the year   9 9
Share of other comprehensive income of associates, net of tax   0 1
Dividends received   (15) (30)
Disposals   (1) (167)
Other movements   1 4
Share of net assets, ending balance   £ 158 £ 154
Millennium Pipeline Company, LLC      
Disclosure of joint ventures [line items]      
Proportion of ownership interest disposed 26.25%