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Trade and other payables: amounts falling due within one year - Narrative (Details) - GBP (£)
£ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Liabilities in respect of put option agreements with vendors £ 13.6 £ 18.8
Level 3    
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Liabilities in respect of put option agreements with vendors £ 12.3