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Financial instruments - Additional Information (Detail) £ in Millions | Jun. 30, 2018 GBP (£)
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Disclosure of detailed information about financial instruments [line items] |
Weighted average growth rate | 23.80%
Risk adjusted discount rate | 2.40%
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 | £ 8.9
Decrease in combined liabilities due to earn out and put option arrangement | 8.7
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 | 6.6
Decrease in combined liabilities due to earn out and put option arrangement | £ 6.9

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