Retirement benefit obligations - Schedule of Movements in Other Post-Retirement Benefits Obligation (Details) - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Movements in Oher Post-Retirement Benefits Obligation [Line Items]
At 1 January	£ 3,488
At 31 December	2,906	£ 3,488
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	(44)	(35)
Actuarial (losses) gains	4	(11)
Insurance premiums paid	3	3
Charge for the year	(2)	(1)
At 31 December	£ (39)	£ (44)

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2024-01-01
-Paragraph 141
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-URIDate 2024-03-27

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- 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
-Name IAS
-Number 19
-IssueDate 2024-01-01
-Paragraph 141
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_c&doctype=Standard
-URIDate 2024-03-27

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- 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
-Name IAS
-Number 19
-IssueDate 2024-01-01
-Paragraph 140
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- Definition

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

+ References

No definition available.

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

+ References

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