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Trade and other payables - Payments Due to Vendors (Detail) - GBP (£) £ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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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

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