INVESTMENTS IN JOINT VENTURES AND ASSOCIATES - Narrative (Details) - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
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	2
Cumulative unrecognised share of losses of joint ventures	5	5	5
Joint ventures
INVESTMENTS IN JOINT VENTURES AND ASSOCIATES (Details) - Schedule of Investments in Joint Ventures and Associates [Line Items]
Investment in joint venture	335	322	£ 279
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	£ 68	£ 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 2022-03-24
-Paragraph 22
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2022-en-r&anchor=para_22_c&doctype=Standard
-URIDate 2022-03-24

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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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