v3.26.1
Investments in joint ventures and associates - Disclosure of share of net assets, joint ventures and associates (Details) - GBP (£)
£ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Disclosure of joint ventures [line items]    
Investments accounted for using equity method, beginning balance £ 608 £ 1,420
Exchange adjustments 13 (50)
Additions 27 116
Share of post-tax results for the year 76 73
Impairment 0 (303)
Dividends received (100) (71)
Disposals 0 (1)
Reclassification to held for sale (note 10) 0 (582)
Other movements 0 6
Investments accounted for using equity method, ending balance 624 608
Total for all joint ventures    
Disclosure of joint ventures [line items]    
Investments accounted for using equity method, beginning balance 434 1,262
Exchange adjustments 30 (46)
Additions 4 93
Share of post-tax results for the year 61 62
Impairment 0 (303)
Dividends received (82) (53)
Disposals 0 0
Reclassification to held for sale (note 10) 0 (582)
Other movements 0 1
Investments accounted for using equity method, ending balance 447 434
Total for all associates    
Disclosure of joint ventures [line items]    
Investments accounted for using equity method, beginning balance 174 158
Exchange adjustments (17) (4)
Additions 23 23
Share of post-tax results for the year 15 11
Impairment 0 0
Dividends received (18) (18)
Disposals 0 (1)
Reclassification to held for sale (note 10) 0 0
Other movements 0 5
Investments accounted for using equity method, ending balance £ 177 £ 174