v3.26.1
Exceptional items and remeasurements - Schedule of remeasurement, tax exceptional items (Details) - GBP (£)
£ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Disclosure Of Exceptional Items [Line Items]      
Operating profit £ 5,431 £ 4,934 £ 4,475
Included within finance income and costs      
Net gains on financial assets at fair value through profit and loss 2 1 4
Finance income and costs (1,325) (1,357) (1,464)
Included within share of post-tax results of joint ventures and associates      
Profit before tax 4,182 3,650 3,048
Included within tax      
Tax on exceptional items and remeasurements (939) (821) (831)
Analysis of total exceptional items and remeasurements after tax      
Profit after tax from continuing operations 3,243 2,829 2,217
Exceptional items and remeasurements, netting      
Disclosure Of Exceptional Items [Line Items]      
Operating profit 387 169 (987)
Included within share of post-tax results of joint ventures and associates      
Profit before tax 333 171 (1,036)
Included within tax      
Tax on exceptional items and remeasurements 16 40 152
Analysis of total exceptional items and remeasurements after tax      
Profit after tax from continuing operations 349 211 (884)
Exceptional items      
Disclosure Of Exceptional Items [Line Items]      
Operating profit 376 42 (1,011)
Included within tax      
Tax on exceptional items and remeasurements 8 76 159
Analysis of total exceptional items and remeasurements after tax      
Profit after tax from continuing operations 384 118 (852)
Remeasurements      
Included within finance income and costs      
Net gains on financial assets at fair value through profit and loss 2 1 4
Net (losses)/gains on financing derivatives (56) 3 11
Finance income and costs (54) 4 15
Included within share of post-tax results of joint ventures and associates      
Net losses on financial instruments 0 (2) (64)
Included within tax      
Tax on exceptional items and remeasurements 8 (36) (7)
Analysis of total exceptional items and remeasurements after tax      
Profit after tax from continuing operations £ (35) £ 93 £ (32)