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Accounting policies - Summary of Property, Plant and Equipment Useful Economic Life (Details)
 12 Months Ended
Dec. 31, 2024
Bottom of range | Furniture and fittings  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful economic life (in years) 3 years
Bottom of range | Office equipment  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful economic life (in years) 3 years
Bottom of range | Computer hardware and software  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful economic life (in years) 2 years
Top of range | Furniture and fittings  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful economic life (in years) 6 years
Top of range | Office equipment  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful economic life (in years) 10 years
Top of range | Computer hardware and software  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful economic life (in years) 5 years