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Leases - Lease payments (Details) - GBP (£)
£ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Leases      
Future minimum payments £ 504 £ 516  
Effect of discounting (59) (71)  
Total 445 445 £ 460
Less than one year      
Leases      
Future minimum payments 150 146  
Between 1 and 5 years      
Leases      
Future minimum payments 289 298  
More than five years      
Leases      
Future minimum payments £ 65 £ 72