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Financial instruments fair value disclosures - Summary of Changes in Level 3 (Detail)
£ in Thousands
 6 Months Ended
Jun. 30, 2022
GBP (£)
Summary of changes in level 3 of fair value of hierarchy [Line Items]  
Beginning balance £ 4,123
Ending balance 4,334
Provision for deferred cash consideration [member]  
Summary of changes in level 3 of fair value of hierarchy [Line Items]  
Beginning balance 4,123
Ending balance 4,334
Level 3 of fair value hierarchy [member]  
Summary of changes in level 3 of fair value of hierarchy [Line Items]  
Beginning balance 7,995
Settled during the period 0
Movement during the period (1,091)
Ending balance 6,904
Level 3 of fair value hierarchy [member] | Provision for deferred cash consideration [member]  
Summary of changes in level 3 of fair value of hierarchy [Line Items]  
Beginning balance 4,123
Movement during the period 211
Ending balance £ 4,334