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Share-based payments - Range of Exercise Prices of Options (Details) - 12 months ended Dec. 31, 2023
£ / shares
$ / shares
Ordinary shares    
Disclosure of range of exercise prices of outstanding share options [line items]    
Weighted average contractual life (Months) 70 months  
American depository receipts    
Disclosure of range of exercise prices of outstanding share options [line items]    
Weighted average contractual life (Months) 80 months  
Bottom of Range | Ordinary shares    
Disclosure of range of exercise prices of outstanding share options [line items]    
Exercise price (in pound per share) | £ / shares £ 7.344  
Bottom of Range | American depository receipts    
Disclosure of range of exercise prices of outstanding share options [line items]    
Exercise price (in dollars per share) | $ / shares   $ 44.120
Top of Range | Ordinary shares    
Disclosure of range of exercise prices of outstanding share options [line items]    
Exercise price (in pound per share) | £ / shares 17.055  
Top of Range | American depository receipts    
Disclosure of range of exercise prices of outstanding share options [line items]    
Exercise price (in dollars per share) | $ / shares   115.940
Weighted average | Ordinary shares    
Disclosure of range of exercise prices of outstanding share options [line items]    
Exercise price (in pound per share) | £ / shares £ 10.455  
Weighted average | American depository receipts    
Disclosure of range of exercise prices of outstanding share options [line items]    
Exercise price (in dollars per share) | $ / shares   $ 64.166