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Tax - Reconciliation (Details) - GBP (£)
£ in Millions
 12 Months Ended
Apr. 01, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Tax        
UK corporation tax 25.00% 25.00% 23.50% 19.00%
Profit before tax   £ 6,195 £ 6,178 £ 5,132
Expected tax charge   (1,549) (1,452) (975)
Losses and temporary differences in year where no deferred tax asset recognised   (18) (56) (118)
Foreign profits and losses taxed at other rates   37 10 (62)
losses on disposals and write-downs   (22) (63) (10)
UK Bank Levy   (31) (27) (20)
regulatory and legal actions   (47) (1) (7)
other disallowable items   (61) (57) (51)
foreign exchange recycling on UBIDAC capital reduction     114  
RPI-related uplift on index-linked gilts   18 6 67
other non-taxable items   11 20 29
Taxable foreign exchange movements   7 9 (19)
Unrecognised losses bought forward and utilised   33 27 6
Banking surcharge   (169) (236) (447)
Pillar 2 top-up tax   (20)    
Tax on paid-in equity dividends   53 52 43
UK tax rate change impact       (10)
Adjustments in respect of prior years   (135) (165) 32
Tax charge for the period   (1,465) (1,434) (1,275)
UNITED KINGDOM        
Tax        
Profit before tax   6,146 6,196 5,716
Net increase/(decrease) in the carrying value of deferred tax assets in respect of:   378 371 272
Benefit from group relief and loss relief claims at higher tax rates   61    
IRELAND        
Tax        
Net increase/(decrease) in the carrying value of deferred tax assets in respect of:     (1) £ (5)
NETHERLANDS        
Tax        
Net increase/(decrease) in the carrying value of deferred tax assets in respect of:   £ 50 £ 15