v3.25.4

Retirement benefit obligations - Schedule of Movements in Other Post-Retirement Benefits Obligation (Details) - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Movements in Oher Post-Retirement Benefits Obligation [Line Items]
At 1 January	£ 2,906
At 31 December	2,575	£ 2,906
Other post retirement benefit plans defined benefit
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Movements in Oher Post-Retirement Benefits Obligation [Line Items]
At 1 January	(39)	(44)
Actuarial gains	2	4
Insurance premiums paid	2	3
Charge for the year	(2)	(2)
At 31 December	£ (37)	£ (39)

X

- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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X

- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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X

- Definition

Decrease In Net Defined Benefit Liability (Asset) Resulting From Insurance Premium Paid

+ References

No definition available.

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- Definition

RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Movements in Oher Post-Retirement Benefits Obligation [Line Items]

+ References

No definition available.

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