Retirement benefit obligations - Schedule of Charges to Income Statement (Details) - GBP (£) £ in Millions	6 Months Ended
Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024
Schedule of Retirement Benefit Charges to Income Statement [Line Items]
Income statement credit	£ (15)	£ 10	£ (21)
Defined contribution schemes	285	240	297
Total charge to the income statement	£ 270	£ 250	£ 276

The amount of post-employment benefit expense included in profit or loss relating to defined benefit plans. [Refer: Profit (loss); Defined benefit plans [domain]] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from expense (income) in profit or loss]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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- Definition

The amount of post-employment benefit expense included in profit or loss

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- Definition

Schedule Of Retirement Benefit Charges To Income Statement

+ References

No definition available.

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