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Employee benefit expense - Number of Directors (Details)
12 Months Ended
Dec. 31, 2022
Option
director
Dec. 31, 2021
Option
director
Dec. 31, 2020
Option
director
Number of Directors accruing retirement benefits      
-defined contribution schemes   2 3
Number of Directors exercising share options 1 2 2
Number of Directors receiving shares as part of long-term incentive schemes 2 2 3
Highest paid director      
Number of Directors accruing retirement benefits      
Shares options exercised | Option 0 163,625 0