Annual report [Section 13 and 15(d), not S-K Item 405]

Share based compensation - Option Activity (Details)

v3.25.1
Share based compensation - Option Activity (Details) - GBP (£)
£ / shares in Units, £ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Options      
Exercised (in shares) (8,976,462) (14,614,410) (5,823,534)
Additional disclosures      
Outstanding - Aggregate Intrinsic Value   £ 131  
Employee Stock Option [Member]      
Options      
Outstanding at the beginning of the period (in shares) 191,150,175    
Granted (in shares) 89,842,812    
Exercised (in shares) (8,976,462)    
Expired (in shares) (14,454,205)    
Forfeited (in shares) (4,175,144)    
Outstanding at the end of the period (in shares) 253,387,176 191,150,175  
Weighted Average Exercise Price Per Option      
Outstanding at the beginning of the period (in dollars per share) £ 0.41    
Granted (in dollars per share) 0.08    
Exercise price (in dollars per share) 0.01    
Expired (in dollars per share) 0.52    
Forfeited (in dollars per share) 0.07    
Outstanding at the end of the period (in dollars per share) £ 0.31 £ 0.41  
Additional disclosures      
Outstanding - Average Remaining Contractual Term (Years) 6 years 10 months 24 days    
Outstanding - Aggregate Intrinsic Value £ 4,698    
Exercisable - Options 129,110,391    
Exercisable - Weighted Average Exercise Price Per Option £ 0.5    
Exercisable - Average Remaining Contractual Term (Years) 5 years 1 month 6 days    
Exercisable - Aggregate Intrinsic Value £ 873    
Options with nominal exercise price      
Options      
Outstanding at the beginning of the period (in shares)      
Outstanding at the end of the period (in shares) 66,532,906    
Additional disclosures      
Exercisable - Options 12,341,961    
Options granted on market value at grant date      
Options      
Outstanding at the beginning of the period (in shares) 147,670,115    
Granted (in shares) 55,282,716 60,891,430 31,826,293
Exercised (in shares) (622,278)    
Expired (in shares) (14,378,110)    
Forfeited (in shares) (1,098,173)    
Outstanding at the end of the period (in shares) 186,854,270 147,670,115  
Weighted Average Exercise Price Per Option      
Outstanding at the beginning of the period (in dollars per share) £ 0.53    
Granted (in dollars per share) 0.12    
Exercise price (in dollars per share) 0.09    
Expired (in dollars per share) 0.53    
Forfeited (in dollars per share) 0.27    
Outstanding at the end of the period (in dollars per share) £ 0.41 £ 0.53  
Additional disclosures      
Outstanding - Average Remaining Contractual Term (Years) 6 years 4 months 24 days    
Outstanding - Aggregate Intrinsic Value £ 4    
Exercisable - Options 116,768,430    
Exercisable - Weighted Average Exercise Price Per Option £ 0.49    
Exercisable - Average Remaining Contractual Term (Years) 5 years    
Exercisable - Aggregate Intrinsic Value £ 2    
Restricted Stock Units (RSUs) [Member]      
Options      
Outstanding at the beginning of the period (in shares) 43,480,060    
Granted (in shares) 34,560,096    
Exercised (in shares) (8,354,184)    
Expired (in shares) (76,095)    
Forfeited (in shares) (3,076,971)    
Outstanding at the end of the period (in shares)   43,480,060  
Additional disclosures      
Outstanding - Average Remaining Contractual Term (Years) 8 years 1 month 6 days 8 years 1 month 6 days  
Outstanding - Aggregate Intrinsic Value £ 4,695 £ 4,470  
Exercisable - Average Remaining Contractual Term (Years) 6 years 1 month 6 days    
Exercisable - Aggregate Intrinsic Value £ 871