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