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Leases - Lease liabilities (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Leases      
Balance at beginning of year £ 217 £ 215  
Exchange differences (1) (4)  
Lease payments (114) (94)  
Interest 10 6 £ 7
Additions 140 89  
Acquisition of companies and businesses 215 5  
Balance at end of year 467 217 215
Non-current 332 139  
Current 135 78  
Total £ 467 £ 217 £ 215