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CRITICAL ACCOUNTING JUDGEMENTS AND ESTIMATES (Details) - Schedule of Expected Credit Loss Relating to House Price Index - GBP (£)
£ in Millions
Dec. 31, 2019
Dec. 31, 2018
HPI 10pp Increase [Member]    
CRITICAL ACCOUNTING JUDGEMENTS AND ESTIMATES (Details) - Schedule of Expected Credit Loss Relating to House Price Index [Line Items]    
ECL impact, £m £ (110) £ (114)
HPI 10pp Decrease [Member]    
CRITICAL ACCOUNTING JUDGEMENTS AND ESTIMATES (Details) - Schedule of Expected Credit Loss Relating to House Price Index [Line Items]    
ECL impact, £m £ 147 £ 154