Share-based payments - Schedule of Assumptions Used for Calculating Benefit Plans (Details)	12 Months Ended
	Dec. 31, 2023 £ / shares
SAYE
SHARE-BASED PAYMENTS (Details) - Schedule of Assumptions Used for Calculating Benefit Plans [Line Items]
Weighted average risk-free interest rate (in percent)	4.52%
Weighted average expected life	3 years 3 months 18 days
Weighted average expected volatility (in percent)	28.00%
Weighted average expected dividend yield (in percent)	6.00%
Weighted average share price (in GBP per share)	£ 0.44
Weighted average exercise price (in GBP per share)	£ 0.39
Executive Share Plans
SHARE-BASED PAYMENTS (Details) - Schedule of Assumptions Used for Calculating Benefit Plans [Line Items]
Weighted average risk-free interest rate (in percent)	4.36%
Weighted average expected life	1 year 10 months 24 days
Weighted average expected volatility (in percent)	30.00%
Weighted average expected dividend yield (in percent)	6.00%
Weighted average share price (in GBP per share)	£ 0.46
Weighted average exercise price (in GBP per share)	£ 0
Long Term Share Plan
SHARE-BASED PAYMENTS (Details) - Schedule of Assumptions Used for Calculating Benefit Plans [Line Items]
Weighted average risk-free interest rate (in percent)	3.71%
Weighted average expected life	3 years 7 months 6 days
Weighted average expected volatility (in percent)	34.00%
Weighted average expected dividend yield (in percent)	6.00%
Weighted average share price (in GBP per share)	£ 0.52
Weighted average exercise price (in GBP per share)	£ 0