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Staff costs - Schedule of options activity (Details) - Santander UK plc shares in Thousands | 12 Months Ended
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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 |  |

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