Post-retirement defined benefit schemes - Principal Assumptions (Details)	Jun. 30, 2020	Dec. 31, 2019
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Principal Actuarial and Financial Assumptions Used in Valuations of Defined Benefit Pension Schemes [Line Items]
Discount rate	1.54%	2.05%
Rate of inflation:
Rate of salary increases	0.00%	0.00%
Weighted-average rate of increase for pensions in payment	2.52%	2.57%
RPI [Member]
Rate of inflation:
Price Index	2.85%	2.94%
CPI [Member]
Rate of inflation:
Price Index	1.90%	1.99%

The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2019-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard
-URIDate 2019-03-27

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- Definition

The expected rate of inflation that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]]

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- Definition

The expected rate of increases in pension that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]]

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The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]]

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