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Operating expenses - Bonus awards reconciliation (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Operating expenses      
Bonus awarded £ 448 £ 356 £ 370
Less: deferral of charge for amounts awarded for current year (144) (114) (127)
Income statement charge for amounts awarded in current year 304 242 243
Add: current year charge for amounts deferred from prior years 109 115 94
Less: forfeiture of amounts deferred from prior years (2) (4) (3)
Income statement charge for amounts deferred from prior years 107 111 91
Income statement charge for bonus awards £ 411 £ 353 £ 334