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Financial instruments - Additional information (Detail)
£ in Millions
Jun. 30, 2022
GBP (£)
Disclosure of detailed information about financial instruments [line items]  
Weighted average growth rate 14.70%
Risk adjusted discount rate 7.70%
0.5 percentage point increase or decrease  
Disclosure of detailed information about financial instruments [line items]  
Decrease in combined liabilities due to earn out and put option arrangement £ 8.2
Increase in combined liabilities due to earn out and put option arrangement 8.4
One percentage point increase or decrease  
Disclosure of detailed information about financial instruments [line items]  
Increase in combined liabilities due to earn out and put option arrangement 8.7
Decrease in combined liabilities due to earn out and put option arrangement £ 9.0