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Related party transactions - Summary of transactions with other related parties (Details)
$ / shares in Units, £ in Thousands, $ in Millions
1 Months Ended 6 Months Ended
Jan. 31, 2022
$ / shares
shares
Jun. 30, 2023
GBP (£)
Options
Jun. 30, 2022
GBP (£)
Apr. 21, 2023
USD ($)
Related party transactions        
Aggregate gain on directors' exercise of share options   £ 8,156 £ 0  
Share based payment charge   7,056 7,294  
Imagination Industries Ltd        
Related party transactions        
Services received, related party transactions   42 0  
Amount outstanding   £ 42 0  
Mr. Slattery | Mr. Fitzpatrick        
Related party transactions        
Number of ordinary shares agreed to purchase upon call option | shares 1,175,000      
Exercise price | $ / shares $ 0.0001      
Aggregate amount agreed to pay | $       $ 2.5
Non executive directors | Nil cost options        
Related party transactions        
Options granted | Options   18,750    
Share based payment charge   £ 55 £ 0  
Options exercised | Options   5,613,287