Retirement benefit obligations - Schedule of Movements in Other Post-Retirement Benefits Obligation (Details) - Other post retirement benefit plans defined benefit - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Movements in Oher Post-Retirement Benefits Obligation [Line Items]
At 1 January	£ (35)	£ (103)
Actuarial (losses) gains	(11)	68
Insurance premiums paid	3	3
Charge for the year	(1)	(2)
Exchange and other adjustments	0	(1)
At 31 December	£ (44)	£ (35)

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 2023-01-01
-Paragraph 141
-Subparagraph a
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-URIDate 2023-03-23

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 141
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_e&doctype=Standard
-URIDate 2023-03-23

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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 [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2023-01-01
-Paragraph 140
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-URIDate 2023-03-23

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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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- Definition

Defined Benefit Plan Actuarial Gain (Loss)1

+ References

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- References

No definition available.

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