Leases - Disclosure of lease liabilities (Details) - GBP (£) £ in Millions |
12 Months Ended | |
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Dec. 31, 2025 |
Dec. 31, 2024 |
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| Reconciliation Of Lease Liabilities [Roll Forward] | ||
| Lease liabilities, beginning balance | £ 542 | £ 280 |
| Interest expense | 29 | 29 |
| New leases | 98 | 11 |
| Disposals | (8) | 0 |
| Cash payments | (69) | (73) |
| Exchange and other movements | 30 | 295 |
| Lease liabilities, ending balance | £ 622 | £ 542 |
| Lease, extension period | 91 years | 91 years |
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- Definition Lease, Extension Period No definition available.
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- Definition Reconciliation Of Lease Liabilities No definition available.
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- Definition The cash outflow for leases. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The increase (decrease) in liabilities arising from financing activities resulting from the effect of changes in foreign exchange rates. [Refer: Liabilities arising from financing activities] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The increase (decrease) in liabilities arising from financing activities resulting from obtaining or losing control of subsidiaries or other businesses. [Refer: Liabilities arising from financing activities; Total for all subsidiaries [member]] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The increase in liabilities arising from financing activities resulting from new leases. [Refer: Liabilities arising from financing activities] Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- References Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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