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Operating expenses - Bonus awards reconciliation (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating expenses      
Bonus Awards £ 301 £ 206 £ 307
Less: deferral of charge for amounts awarded for current year (99) (77) (110)
Income statement charge for amounts awarded in current year 202 129 197
Add: current year charge for amounts deferred from prior years 80 114 127
Less: forfeiture of amounts deferred from prior years (15) (11) (25)
Income statement charge for amounts deferred from prior years 65 103 102
Income statement charge for bonus awards £ 267 £ 232 £ 299