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Share-based payments - Additional information (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2023
Options
£ / shares
Dec. 31, 2022
Options
£ / shares
Two Thousand And Twenty One Incentive Award Plan    
Share-based payments    
Number of options exercisable | Options 1,993,248 1,073,560
Options granted | Options 500,000 5,012,495
Two Thousand And Twenty One Incentive Award Plan | Maximum    
Share-based payments    
Exercise prices | £ / shares £ 6.63 £ 6.63
Two Thousand And Twenty One Incentive Award Plan | Minimum    
Share-based payments    
Exercise prices | £ / shares £ 0 £ 0
EMI Scheme    
Share-based payments    
Number of options exercisable | Options 12,463,199 11,317,247
Expected weighted average remaining vesting period (years) 2 years 1 month 2 days 2 years 7 months 2 days
EMI Scheme | Maximum    
Share-based payments    
Exercise prices | £ / shares £ 1.15 £ 1.15
EMI Scheme | Minimum    
Share-based payments    
Exercise prices | £ / shares £ 0.04 £ 0.04
Company share option plan options | Two Thousand And Twenty One Incentive Award Plan    
Share-based payments    
Expected weighted average remaining vesting period (years) 3 years 2 months 15 days  
Nil cost options | Non executive direcotrs    
Share-based payments    
Options granted | Options 18,750  
Nil cost options | Two Thousand And Twenty One Incentive Award Plan    
Share-based payments    
Expected weighted average remaining vesting period (years) 2 years 7 months 2 days