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Financial instruments - Additional Information (Detail) - GBP (£) £ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020
Disclosure of detailed information about financial instruments [line items] |  |
Weighted average growth rate | 14.60% |
Risk adjusted discount rate | 5.30% |
An increase or decrease in the multiple of 0.5 times revenue [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Increase or decrease in fair value of other investments | £ 24.5 |
Increase decrease on Income statement due to change in fair value of other investment | 1.6 |
Increase decrease on equity due to change in fair value of other investment | 22.9 |
One percentage point increase or decrease [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Increase in combined liabilities due to earn out and put option arrangement | 8.3 | £ 13.1
0.5 percentage point increase or decrease [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Increase in combined liabilities due to earn out and put option arrangement | £ 6.1 | £ 6.2

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