PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Expenditure on Investment Properties - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Schedule of Expenditure on Investment Properties [Abstract]
Acquisitions of new properties	£ 21	£ 81
Additional expenditure on existing properties	52	62
Expenditure on investment properties	£ 73	£ 143

The amount of additions to investment property resulting from acquisitions. [Refer: Investment property]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 40
-IssueDate 2019-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 40
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-Paragraph 79
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-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=40&code=ifrs-tx-2019-en-r&anchor=para_79_d_i&doctype=Standard
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- Definition

The amount of additions to investment property resulting from subsequent expenditure recognised as an asset. [Refer: Investment property]

+ References

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- Definition

The amount of direct operating expenses (including repairs and maintenance) arising from investment property. [Refer: Investment property]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 40
-IssueDate 2019-01-01
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- References

No definition available.

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