Additional cash flow information - Summary of Proceeds from Sale of Property, Plant and Equipment (Detail) - GBP (£) £ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Property, plant and equipment [abstract] | |||
| Net book amount | £ 3 | £ 4 | |
| Profit on sale of property, plant and equipment | 0 | 2 | |
| Proceeds from sale of property, plant and equipment | £ 3 | £ 6 | £ 5 |
| X | ||||||||||
- Definition The decrease in property, plant and equipment resulting from disposals. [Refer: Property, plant and equipment] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- References Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The cash inflow from sales of property, plant and equipment, classified as investing activities. [Refer: Property, plant and equipment] Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- References No definition available.
|