Other assets - Narrative (Details) - GBP (£) £ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items] | |||
| Direct operating expense from investment property generating rental income | £ 27 | £ 44 | |
| Operating income (loss) | |||
| PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items] | |||
| Rental income from investment properties | £ 190 | £ 172 | £ 146 |