v3.26.1
Staff costs - Schedule of options activity (Details) - Santander UK plc
shares in Thousands
 12 Months Ended
Dec. 31, 2025
shares
€ / £
people
contract
£ / shares
Dec. 31, 2024
people
€ / £
shares
£ / shares
Dec. 31, 2023
shares
people
€ / £
£ / shares
Share-based payment arrangement      
Exchange rate | € / £ 1.15 1.21 1.15
Sharesave plan      
Share-based payment arrangement      
Number of shares outstanding, beginning of period 25,689 27,139 29,988
Options granted (in shares) 3,324 4,991 7,175
Options exercised (in shares) (9,966) (4,004) (5,980)
Options cancelled (net) or not exercised (in shares) (1,554) (2,437) (4,044)
Number of share options outstanding, end of period 17,493 25,689 27,139
Options granted (in GBP per share) | £ / shares £ 6.35 £ 3.36 £ 2.78
Options exercised (in GBP per share) | £ / shares 1.9 2.29 1.7
Options cancelled (net) or not exercised (in GBP per share) | £ / shares £ 2.88 £ 2.37 £ 2.53
Number of persons | people 4,637 4,107 4,752
Minimum number of accounts/contracts per employee | contract 1