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RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Movements in Oher Post-Retirement Benefits Obligation - Other Postretirement Benefits Plan [Member] - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Movements in Oher Post-Retirement Benefits Obligation [Line Items]    
Beginning Balance £ (124) £ (144)
Actuarial (losses) gains (6) 18
Insurance premiums paid 7 5
Charge for the year (4) (4)
Exchange and other adjustments 1 1
Ending Balance £ (126) £ (124)