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Trade and other payables - Payments Due to Vendors (Detail) - GBP (£)
£ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Payments due to vendors, Current £ 73.3 £ 62.0
Payments due to vendors, Non-current 125.4 98.1
Payments due to vendors 198.7 160.1
Within one year    
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Payments due to vendors, Current 73.3 62.0
Between one and two years    
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Payments due to vendors, Non-current 54.1 19.5
Between two and three years    
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Payments due to vendors, Non-current 70.9 27.6
Between three and four years    
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Payments due to vendors, Non-current 0.4 28.6
Between four and five years    
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Payments due to vendors, Non-current £ 0.0 £ 22.4