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Financial instruments - Additional Information (Detail) £ in Millions | 6 Months Ended
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Jun. 30, 2020 GBP (£)
Disclosure of detailed information about financial instruments [line items] |
Weighted average growth rate | 16.60%
Risk adjusted discount rate | 1.30%
An increase or decrease in the multiple of zero point five times revenue [member] |
Disclosure of detailed information about financial instruments [line items] |
Increase or decrease in fair value of other investments | £ 26.9
Increase or decrease on Income statement due to change in fair value of other investment | 1.5
Increase or decrease on equity due to change in fair value of other investment | 25.4
One percentage point increase or decrease [member] |
Disclosure of detailed information about financial instruments [line items] |
Decrease in combined liabilities due to earn out and put option arrangement | 3.7
Increase (Decrease) in combined liabilities due to earn out and put option arrangement | 3.8
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 | 4.8
Decrease in combined liabilities due to earn out and put option arrangement | £ 4.7

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