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Leases - Lease payments (Details) - GBP (£)
£ in Millions
Dec. 31, 2023
Dec. 31, 2022
Oct. 12, 2022
Dec. 31, 2021
Leases        
Future minimum payments £ 516 £ 503    
Effect of discounting (71) (43)    
Total 445 460   £ 217
Measurement period adjustments        
Leases        
Total   (7) £ (8)  
Less than one year        
Leases        
Future minimum payments 146 144    
Between 1 and 5 years        
Leases        
Future minimum payments 298 277    
More than five years        
Leases        
Future minimum payments £ 72 £ 82