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GOODWILL (Tables)
12 Months Ended
Dec. 31, 2017
Disclosure of goodwill [text block] [Abstract]  
Disclosure of reconciliation of changes in goodwill [text block]
   2017   2016 
   £m   £m 
At 1 January   2,016    2,016 
Acquisition of businesses (note 22)   302     
Impairment charged to the income statement (note 11)   (8)    
At 31 December   2,310    2,016 
Cost1   2,664    2,362 
Accumulated impairment losses   (354)   (346)
At 31 December   2,310    2,016 
1 For acquisitions made prior to 1 January 2004, the date of transition to IFRS, cost is included net of amounts amortised up to 31 December 2003.