RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Movements in Oher Post-Retirement Benefits Obligation - Other post retirement benefit plans defined benefit - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Movements in Oher Post-Retirement Benefits Obligation [Line Items]
At 1 January	£ (126)	£ (124)
Actuarial gains (losses)	16	(6)
Insurance premiums paid	4	7
Charge for the year	(3)	(4)
Exchange and other adjustments	0	1
At 31 December	£ (109)	£ (126)

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
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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
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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
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The cash outflow for premiums and claims, annuities and other policy benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition

Defined Benefit Plan Actuarial Gain Loss

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