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Share-based payments - Fair value of options granted (Details) - GBP (£)
£ in Thousands
6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Share-based payments    
Total Expense Recognised £ 7,056 £ 7,294
EMI Scheme    
Share-based payments    
Total Expense Recognised 487 6,475
2021 Incentive Plan    
Share-based payments    
Total Expense Recognised 6,513  
Non-Executive Director awards    
Share-based payments    
Total Expense Recognised £ 56  
Suppliers and partners    
Share-based payments    
Total Expense Recognised   £ 819