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Tax - Tax losses (Details) - GBP (£)
£ in Millions
Dec. 31, 2024
Dec. 31, 2023
Unused tax losses    
Deferred tax asset £ 1,876 £ 1,894
Total losses carried forward    
Unused tax losses    
Deferred tax asset 1,106 1,019
Total losses carried forward | UK    
Unused tax losses    
Deferred tax asset 1,018 959
Total losses carried forward | UK | National Westminster Bank Plc    
Unused tax losses    
Deferred tax asset 333 362
Total losses carried forward | UK | RBS plc    
Unused tax losses    
Deferred tax asset 685 597
Total losses carried forward | Ireland | UBIDAC    
Unused tax losses    
Deferred tax asset 5 5
Total losses carried forward | Ireland | NWM N.V.    
Unused tax losses    
Deferred tax asset £ 83 £ 55