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Trade and other payables - Payments Due to Vendors (Detail) - GBP (£)
£ in Millions
Jun. 30, 2021
Dec. 31, 2020
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Payments due to vendors, Current £ 83.7 £ 57.8
Payments due to vendors, Non-current 69.5 56.5
Payments due to vendors 153.2 114.3
Within one year [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Payments due to vendors, Current 83.7 57.8
Between one and two years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Payments due to vendors, Non-current 20.5 17.2
Between two and three years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Payments due to vendors, Non-current 18.4 6.0
Between three and four years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Payments due to vendors, Non-current 19.4 30.5
Between four and five years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]    
Payments due to vendors, Non-current £ 11.2 £ 2.8