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OTHER EQUITY INSTRUMENTS (Tables)
12 Months Ended
Dec. 31, 2017
Disclosure Of Other Equity Instruments Explanatory [Abstract]  
Disclosure Of Other Equity Instruments [text block]
   2017
£m
   2016
£m
   2015
£m
 
At 1 January and 31 December   5,355    5,355    5,355