Related Party Transactions - Summary of Key Management Personnel Compensation (Detail) - GBP (£) £ in Millions |
12 Months Ended | ||
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Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
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| Disclosure of transactions between related parties [abstract] | |||
| Short-term employee benefits | £ 15 | £ 10 | £ 9 |
| Retirement benefits | 1 | 1 | 1 |
| Share-based payment costs | 16 | 19 | 11 |
| Total | £ 32 | £ 30 | £ 21 |
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- References No definition available.
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- References Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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