RELATED PARTY TRANSACTIONS - Schedule of Compensation of Key Management Personnel (Details) - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Compensation
Salaries and other short-term benefits	£ 10	£ 13	£ 15
Post-employment benefits	0	0	0
Share-based payments	15	13	15
Total compensation	£ 25	£ 26	£ 30

The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

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The amount of compensation to key management personnel in the form of post-employment benefits. [Refer: Key management personnel of entity or parent [member]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Salaries and other short-term benefits

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