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Financial instruments - Additional information (Detail)
£ in Millions
Jun. 30, 2023
GBP (£)
Disclosure of detailed information about financial instruments [line items]  
Weighted average growth rate 11.60%
Risk adjusted discount rate 7.40%
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 £ 6.3
Increase in combined liabilities due to earn out and put option arrangement 6.5
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 8.6
Decrease in combined liabilities due to earn out and put option arrangement £ 8.3