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Ordinary dividends - Summary of Proposed Final Dividend (Details) - £ / shares
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of Dividends [abstract]      
Proposed final dividend (pence per share) £ 0.2440 £ 0.2440 £ 0.1870