Property, plant and equipment - Narrative (Details) - GBP (£) £ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Disclosure of detailed information about property, plant and equipment [line items] | |||
| Other income | £ 48 | £ 52 | £ 62 |
| Investment property | |||
| Disclosure of detailed information about property, plant and equipment [line items] | |||
| Other income | £ 7 | £ 8 | |