RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Retirement Benefits Recognised in Balance Sheet - GBP (£) £ in Millions	Dec. 31, 2017	Dec. 31, 2016
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Retirement Benefits Recognised in Balance Sheet [Line Items]
Defined benefit pension schemes	£ 723	£ 342
Net amount recognised in the balance sheet [Member]
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Retirement Benefits Recognised in Balance Sheet [Line Items]
Retirement benefit assets	723	342
Retirement benefit obligations	(358)	(822)
Total amounts recognised in the balance sheet	365	(480)
Defined benefit pension schemes	509	(244)
Other post-retirement benefit schemes	£ (144)	£ (236)

The amount of assets held by retirement benefit plans. [Refer: Defined benefit plans [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 26
-IssueDate 2016-01-13
-Paragraph 35
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=26&date=2016-03-30&anchor=para_35_a_i&doctype=Standard
-URIDate 2016-03-31

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- Definition

The amount of non-current assets other than financial instruments, deferred tax assets, post-employment benefit assets and rights arising under insurance contracts. [Refer: Deferred tax assets; Financial instruments, class [member]; Non-current assets; Insurance contracts [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 8
-IssueDate 2016-01-13
-Paragraph 33
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2016-03-30&anchor=para_33_b&doctype=Standard
-URIDate 2016-03-31

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- Definition

The amount of surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2016-01-13
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_55&doctype=Standard
-URIDate 2016-03-31

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- References

No definition available.

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- References

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