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Leases - Lease liabilities by currency (Details) - GBP (£)
£ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Leases      
Lease liabilities £ 467 £ 217 £ 215
Pound sterling      
Leases      
Lease liabilities 34 33  
Euro      
Leases      
Lease liabilities 61 57  
US dollar      
Leases      
Lease liabilities 314 89  
Other currencies      
Leases      
Lease liabilities £ 58 £ 38