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Operating expenses (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating expenses      
Salaries £ 2,483 £ 2,250 £ 2,295
Bonus awards 353 334 267
Temporary and contract costs 199 234 240
Social security costs 352 328 300
Pension costs 313 363 354
- defined benefit schemes 122 205 215
- defined contribution schemes 191 158 139
Other 201 207 220
Staff costs 3,901 3,716 3,676 [1]
Premises and equipment 1,153 1,112 1,133 [1]
UK bank levy 109 101 99
Depreciation and amortisation 934 833 923 [1]
Other administrative expenses 1,899 1,925 1,927
Administrative expenses 4,095 3,971 4,082
Operating expenses 7,996 7,687 7,758 [1]
Impairment of goodwill     85
Depreciation on right of use assets £ 104 £ 119 £ 167
[1] Comparative results have been re-presented from those previously published to reclassify certain items as discontinued operations as described in Note 8 to the consolidated financial statements.