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Intangible assets (Tables)
6 Months Ended
Jun. 30, 2022
Text block [abstract]  
Summary of Detailed Information about Intangible Assets
 
    
Acquired
development
programs
 
Cost
  
£’000
 
At January 1, 2022 and June 30, 2022
  
 
33,005
 
    
 
 
 
Accumulated revision to estimated value
        
At January 1, 2022
     (8,441
Revision to estimated value
     (448
    
 
 
 
At June 30, 2022
  
 
(8,889
    
 
 
 
Net book value
        
At January 1, 2022
     24,564  
    
 
 
 
At June 30, 2022
  
 
24,116