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CONTINGENT LIABILITIES AND COMMITMENTS (Details) - Schedule of Contingent Liabilities - GBP (£)
£ in Millions
Dec. 31, 2017
Dec. 31, 2016
Contingent liabilities    
Acceptances and endorsements £ 71 £ 21
Other items serving as direct credit substitutes 740 779
Performance bonds and other transaction-related contingencies 2,300 2,237
3,040 3,016
Total contingent liabilities £ 3,111 £ 3,037