Impairment - Narrative (Details) - GBP (£) £ in Millions |
6 Months Ended | ||
|---|---|---|---|
Jun. 30, 2026 |
Dec. 31, 2025 |
Jun. 30, 2025 |
|
| Disclosure of impairment loss and reversal of impairment loss [abstract] | |||
| Residual impairment and voluntary termination charges | £ 78 | £ 67 | £ 70 |