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Leases - Lease liabilities by currency (Details) - GBP (£)
£ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Leases      
Lease liabilities £ 445 £ 445 £ 460
Pound sterling      
Leases      
Lease liabilities 43 34  
Euro      
Leases      
Lease liabilities 75 63  
US dollar      
Leases      
Lease liabilities 267 289  
Other currencies      
Leases      
Lease liabilities £ 60 £ 59