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Capital and reserves, Private investment in public equity ("PIPE") (Details)
1 Months Ended
Feb. 09, 2021
GBP (£)
Feb. 09, 2021
USD ($)
Jul. 31, 2022
GBP (£)
shares
Jul. 31, 2022
USD ($)
shares
Dec. 31, 2022
£ / shares
shares
Jul. 13, 2022
£ / shares
shares
Jul. 13, 2022
$ / shares
shares
Issued share [Abstract]              
Gross proceeds     £ 116,812,000 $ 140,000,000      
Offering expenses | £     388,000        
Investors [Member]              
Issued share [Abstract]              
Gross proceeds     116,812,000 $ 140,000,000      
Offering expenses | £     £ 388,000        
Ordinary Shares [Member]              
Issued share [Abstract]              
Number of shares issued (in shares) | shares     3,733,333 3,733,333 20    
Par value per share (in pounds per share) | £ / shares         £ 0.0001    
Share price (in dollars per share) | £ / shares         £ 0.002    
ADS [Member]              
Issued share [Abstract]              
Number of shares issued (in shares) | shares           2,000,000 2,000,000
Number of ordinary share in each ADSs (in shares) | shares           1 1
Par value per share (in pounds per share) | £ / shares           £ 0.002  
Gross proceeds £ 226,528,000 $ 312,083,000          
ADS [Member] | Investors [Member]              
Issued share [Abstract]              
Share price (in dollars per share) | $ / shares             $ 37.5
Non-voting Ordinary Shares [Member]              
Issued share [Abstract]              
Number of shares issued (in shares) | shares           1,733,333 1,733,333
Par value per share (in pounds per share) | £ / shares           £ 0.002  
Non-voting Ordinary Shares [Member] | Investors [Member]              
Issued share [Abstract]              
Share price (in dollars per share) | $ / shares             $ 37.5