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Earnings per share (Details) £ in Millions	12 Months Ended
	Dec. 31, 2023 GBP (£) Option	Dec. 31, 2022 Option	Dec. 31, 2021 Option
Share options
Earnings per share
Anti-dilutive share options | Option	18,422	1,290,294	0
LTIP
Earnings per share
Consideration for issuance of share options | £	£ 0

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Number of (units of) instruments that are antidilutive in the period presented.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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