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Financial instruments - Additional Information (Detail) £ in Millions | 6 Months Ended
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Jun. 30, 2019 GBP (£)
Disclosure of detailed information about financial instruments [line items] |
Weighted average growth rate | 22.60%
Risk adjusted discount rate | 1.50%
An increase or decrease in the multiple of one times revenue [member] |
Disclosure of detailed information about financial instruments [line items] |
Increase or decrease in fair value of other investments | £ 55.9
Increase decrease on Income statement due to change in fair value of other investment | 12.6
Increase decrease on equity due to change in fair value of other investment | 43.3
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 | 7.4
Decrease in combined liabilities due to earn out and put option arrangement | 12.6
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 | 6.8
Decrease in combined liabilities due to earn out and put option arrangement | £ 6.6

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