Lease arrangements - Summary of lease liability (Details) - GBP (£) £ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure of lease liabilities | ||
| Total lease liabilities | £ (97) | £ (103) |
| Property | ||
| Disclosure of lease liabilities | ||
| Current lease liabilities | (29) | (37) |
| Non-current lease liabilities | (65) | (63) |
| Non-property | ||
| Disclosure of lease liabilities | ||
| Current lease liabilities | (1) | (1) |
| Non-current lease liabilities | £ (2) | £ (2) |