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Fair value estimation - Contingent consideration (Details) - Contingent consideration - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Fair value estimation    
Balance at the beginning £ 75 £ 63
Exchange differences (2) (8)
Acquisitions 18 24
Payments (24) (12)
Revaluation of put option through equity 3 8
Balance at the end £ 70 £ 75