v3.25.4

Retirement benefit obligations - Schedule of Retirement Benefit Total Amounts Recognized in Balance Sheet (Details) - GBP (£) £ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Retirement Benefit Total Amounts Recognized in Balance Sheet [Line Items]
Retirement benefit assets	£ 2,695	£ 3,028
Retirement benefit obligations	(120)	(122)
Defined benefit asset	2,575	2,906
Defined benefit pension schemes
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Retirement Benefit Total Amounts Recognized in Balance Sheet [Line Items]
Retirement benefit assets	2,695	3,028
Retirement benefit obligations	(83)	(83)
Defined benefit asset	2,612	2,945	£ 3,532
Other retirement benefit schemes
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Retirement Benefit Total Amounts Recognized in Balance Sheet [Line Items]
Defined benefit asset	£ (37)	£ (39)

X

- Definition

The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [domain]]

+ References

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [domain]]

+ References

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

The amount of deficit in a defined benefit plan. [Refer: Defined benefit plans [domain]]

+ References

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