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TAX EXPENSE (Details) - Schedule of Income Tax Charges - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of income tax [Abstract]      
Tax credit (expense) attributable to policyholders £ 4 £ (148) £ 14
Shareholder tax credit (expense) 157 (1,239) (1,468)
Tax credit (expense) £ 161 £ (1,387) £ (1,454)