v3.25.2
Share-based payments - Movements in the number and weighted average exercise price of share options (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2025
Options
£ / shares
Dec. 31, 2024
Options
£ / shares
2021 Incentive Plan    
Share-based payments    
Outstanding, start of period 1,171,210 998,598
Granted during the period 2,252,530 397,803
Exercised during the period (61,524) (128,369)
Forfeited during the period (79,816) (96,822)
Outstanding, end of period 3,282,400 1,171,210
Weighted average exercise price, Outstanding, start of period | £ / shares £ 0.91 £ 1.2
Weighted average exercise price, Granted during the period | £ / shares 0.09 0.4
Weighted average exercise price, Forfeited during the period | £ / shares 1.27 2.97
Weighted average exercise price, Outstanding, end of period | £ / shares £ 0.35 £ 0.91
EMI Scheme    
Share-based payments    
Outstanding, start of period 945,429 1,170,231
Exercised during the period (6,184)  
Forfeited during the period (42,621) (224,802)
Outstanding, end of period 896,624 945,429
Weighted average exercise price, Outstanding, start of period | £ / shares £ 2.2 £ 2.5
Weighted average exercise price, Exercised during the period | £ / shares 1.8  
Weighted average exercise price, Forfeited during the period | £ / shares 11 3.8
Weighted average exercise price, Outstanding, end of period | £ / shares £ 1.8 £ 2.2