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Share capital and reserves - Additional Information (Details) - GBP (£)
£ in Thousands
6 Months Ended 12 Months Ended
Jun. 05, 2022
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Disclosure of classes of share capital [line items]          
Reclassification of warrants   £ 1,010   £ 111,611  
Share based payment transactions   7,294 £ 16,815 156 £ 96
Foreign exchange translation differences   9,482      
Share premium.          
Disclosure of classes of share capital [line items]          
Reclassification of warrants       103,053  
Share based payment transactions £ 749 749 £ 16,739    
Shares issued during the period 150,000        
Other reserves          
Disclosure of classes of share capital [line items]          
Reclassification of warrants   1,010   £ 8,558  
Share based payment transactions   6,465     £ 0
Foreign exchange translation differences   £ 9,482