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Trade and other payables - Payments due to vendors (Detail) - GBP (£) £ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |
Within one year | £ 40.0 | £ 85.6
Payments due to vendors, Non-current | 133.1 | 111.1
Payments due to vendors | 173.1 | 196.7
Within one year |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |
Within one year | 40.0 | 85.6
Between 1 and 2 years |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |
Payments due to vendors, Non-current | 46.2 | 24.0
Between 2 and 3 years |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |
Payments due to vendors, Non-current | 48.2 | 35.7
Between 3 and 4 years |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |
Payments due to vendors, Non-current | 17.5 | 51.4
Between 4 and 5 years |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |
Payments due to vendors, Non-current | 10.8 | 0.0
Over 5 years |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line items] |  |
Payments due to vendors, Non-current | £ 10.4 | £ 0.0

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