RELATED PARTY TRANSACTIONS (Details) - Schedule of Compensation of Key Management Personnel - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Compensation
Salaries and other short-term benefits	£ 13	£ 15	£ 14
Post-employment benefits	0	0	0
Share-based payments	13	15	18
Total compensation	£ 26	£ 30	£ 32

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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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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Salaries and other short-term benefits

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