INVESTMENTS IN JOINT VENTURES AND ASSOCIATES - Narrative (Details) - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
INVESTMENTS IN JOINT VENTURES AND ASSOCIATES (Details) - Schedule of Investments in Joint Ventures and Associates [Line Items]
Unrecognised share of losses of associates	£ 0	£ 0	£ 0
Cumulative unrecognised share of losses of associates	2	2	17
Cumulative unrecognised share of losses of joint ventures	5	5	3
Joint ventures
INVESTMENTS IN JOINT VENTURES AND ASSOCIATES (Details) - Schedule of Investments in Joint Ventures and Associates [Line Items]
Investment in joint venture	322	£ 279	£ 293
Joint ventures \| Loans and receivables, category
INVESTMENTS IN JOINT VENTURES AND ASSOCIATES (Details) - Schedule of Investments in Joint Ventures and Associates [Line Items]
Investment in joint venture	£ 73

The cumulative amount of the unrecognised share of losses of associates if the entity has stopped recognising its share of losses when applying the equity method. [Refer: Associates [member]; Unrecognised share of losses of associates]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2021-01-01
-Paragraph 22
-Subparagraph c
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-URIDate 2021-03-24

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The cumulative amount of the unrecognised share of losses of joint ventures if the entity has stopped recognising its share of losses when applying the equity method. [Refer: Joint ventures [member]; Unrecognised share of losses of joint ventures]

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The amount of the unrecognised share of associates' losses if the entity has stopped recognising its share of losses when applying the equity method. [Refer: Associates [member]]

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