Adjustments of tax expense (income) recognised in the period for current tax of prior periods.

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Adjustments of tax expense (income) recognised in the period for the deferred tax of prior periods.

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The applicable income tax rate.

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The amount of benefit arising from a previously unrecognised tax loss, tax credit or temporary difference of a prior period that is used to reduce deferred tax expense. [Refer: Deferred tax expense (income); Temporary differences [member]; Unused tax losses [member]; Unused tax credits [member]]

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TAX EXPENSE (Details) - Narrative - GBP (£) £ in Millions		3 Months Ended	12 Months Ended
TAX EXPENSE (Details) - Narrative - GBP (£) £ in Millions	Apr. 01, 2020	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
TAX EXPENSE (Details) - Narrative [Line Items]
Applicable tax rate (in percent)	17.00%	19.00%
Adjustments for current tax of prior periods			£ 104	£ 237	£ (13)
UK corporation tax:
TAX EXPENSE (Details) - Narrative [Line Items]
Applicable tax rate (in percent)			19.00%	19.00%	19.00%
UK corporation tax: \| Capitalised software enhancements
TAX EXPENSE (Details) - Narrative [Line Items]
Adjustments for current tax of prior periods			£ 215	£ 0
Adjustments for deferred tax of prior periods			261
Tax benefit arising from previously unrecognised tax loss of prior period used to reduce deferred tax expense			£ 46