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Goodwill - Schedule of changes in intangible assets and goodwill (Details) - GBP (£)
£ in Millions
12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Reconciliation of changes in goodwill [abstract]    
Goodwill at beginning of period £ 9,847 £ 9,532
Exchange adjustments (118) 315
Goodwill at end of period £ 9,729 £ 9,847