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Share-based payments - Movements in the number of share options (Details) - Options
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Share-based payments    
Outstanding, start of period 16,817  
Granted during the period 3,147 16,817
Forfeited during the period (294)  
Outstanding, end of period 19,670 16,817