v3.26.1
Assets held for sale and discontinued operations - Summary of Statement of Comprehensive Income for discontinued operations (Details) - GBP (£)
£ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Disclosure of analysis of other comprehensive income by item [line items]      
Profit after tax from discontinued operations £ 0 £ 76 £ 74
Items from discontinued operations that may be reclassified subsequently to profit or loss:      
Net (losses)/gains on investments in debt instruments measured at fair value through other comprehensive income 8 1 21
Tax on items that may be reclassified subsequently to profit or loss 21 (40) (66)
Total items from continuing operations that may be reclassified subsequently to profit or loss (327) (225) (114)
Other comprehensive loss (217) (330) (300)
Total comprehensive income for the year £ 3,026 2,575 1,991
Discontinued operations      
Disclosure of analysis of other comprehensive income by item [line items]      
Profit after tax from discontinued operations   76 74
Items from discontinued operations that may be reclassified subsequently to profit or loss:      
Net (losses)/gains on investments in debt instruments measured at fair value through other comprehensive income   (13) 13
Tax on items that may be reclassified subsequently to profit or loss   3 (3)
Total items from continuing operations that may be reclassified subsequently to profit or loss   (10) 10
Other comprehensive loss   (10) 10
Total comprehensive income for the year   £ 66 £ 84