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Share-based payments - Movements in the number and weighted average exercise price of share options (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    
Outstanding, start of period 4,355,669  
Granted during the period 500,000 5,012,495
Exercised during the period (346,755)  
Forfeited during the period (132,693) (656,826)
Outstanding, end of period 4,376,221 4,355,669
Average Outstanding, start of period | £ / shares £ 6.63  
Average Granted during the period | £ / shares   £ 6.63
Average Forfeited during the period | £ / shares 6.63 6.63
Average Outstanding, end of period | £ / shares £ 6.63 £ 6.63
EMI Scheme    
Share-based payments    
Outstanding, start of period 21,011,084 19,670
Grant arising due to scheme modification   23,213,933
Exercised during the period (6,642,385) (645,571)
Forfeited during the period (7,875) (1,576,948)
Outstanding, end of period 14,360,824 21,011,084
Average Outstanding, start of period | £ / shares £ 0.19 £ 308.06
Average Granted due to scheme modification | £ / shares   0.23
Average Exercised during the period | £ / shares 0.09 0.17
Average Forfeited during the period | £ / shares 0.18 0.83
Average Outstanding, end of period | £ / shares £ 0.24 £ 0.19