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Business combinations - Additional information (Details) - Individually immaterial acquisitions - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Business combinations    
Deferred consideration £ 15 £ 22
Contingent consideration £ 43 23
Payment term for both deferred and contingent consideration 5 years  
Release of contingent consideration liabilities not paid £ 0 £ 10