RETIREMENT BENEFIT OBLIGATIONS - Schedule of Principal Actuarial and Financial Assumptions Used in Valuation of Defined Benefit Pension Schemes (Details)	Dec. 31, 2021	Dec. 31, 2020
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Principal Actuarial and Financial Assumptions Used in Valuation of Defined Benefit Pension Schemes [Line Items]
Discount rates (in percent)	1.94%	1.44%
Rate of inflation:
Rate of salary increases (in percent)	0.00%	0.00%
Weighted-average rate of increase for pensions in payment (in percent)	2.88%	2.61%
Retail Price Index (RPI)
Rate of inflation:
Price Index (in percent)	3.21%	2.80%
Consumer Price Index (CPI)
Rate of inflation:
Price Index (in percent)	2.92%	2.41%

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 2021-01-01
-Paragraph 144
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-URIDate 2021-03-24

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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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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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