v3.25.4
Share-based payments - Disclosure of movements in options and awards (Details)
 12 Months Ended
Dec. 31, 2025
shares
£ / shares
Dec. 31, 2024
shares
£ / shares
SVP and DSVP    
Reconciliation of options and award plans [Roll Forward]    
Outstanding at beginning of year/acquisition date (in shares) 441,713,000 435,820,000
Transfers within the year (in shares) (1,095,000) (2,528,000)
Granted in the year (in shares) 129,006,000 202,420,000
Exercised/released in the year (in shares) (169,166,000) (171,810,000)
Less: forfeited in the year (in shares) (19,179,000) (22,189,000)
Less: expired in the year (in shares) 0 0
Outstanding at end of year (in shares) 381,279,000 441,713,000
Number of options exercisable (in shares) 0 0
Reconciliation of share price of options and award plans [Roll Forward]    
Outstanding at beginning of year, weighted average exercise price (in GBP per share) | £ / shares £ 1.74  
Outstanding at end of year, weighted average exercise price (in GBP per share) | £ / shares £ 3.09 £ 1.74
Others    
Reconciliation of options and award plans [Roll Forward]    
Outstanding at beginning of year/acquisition date (in shares) 43,901,000 51,363,000
Transfers within the year (in shares) 391,000 1,780,000
Granted in the year (in shares) 53,384,000 84,383,000
Exercised/released in the year (in shares) (60,633,000) (90,721,000)
Less: forfeited in the year (in shares) (1,461,000) (2,611,000)
Less: expired in the year (in shares) (187,000) (293,000)
Outstanding at end of year (in shares) 35,395,000 43,901,000
Number of options exercisable (in shares) 8,013,000 4,956,000
Sharesave    
Reconciliation of options and award plans [Roll Forward]    
Number of options exercisable (in shares) 4,323,541 828,340
Reconciliation of share price of options and award plans [Roll Forward]    
Outstanding at beginning of year, weighted average exercise price (in GBP per share) | £ / shares £ 1.17 £ 1.05
Granted in the year, weighted average exercise price (in GBP per share) | £ / shares 3.01 1.79
Exercised/released in the year, weighted average exercise price (in GBP per share) | £ / shares 0.99 0.95
Less: forfeited in the year, weighted average exercise price (in GBP per share) | £ / shares 1.36 1.20
Less: expired in the year, weighted average exercise price (in GBP per share) | £ / shares 1.18 1.25
Outstanding at end of year, weighted average exercise price (in GBP per share) | £ / shares 1.52 1.17
Exercisable, weighted average exercise price (in GBP per share) | £ / shares £ 0.94 £ 1.23