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Material accounting policies - Property plant and equipment (Details)
12 Months Ended
Dec. 31, 2025
Furniture, fittings and equipment | Minimum  
Disclosure Of Material Accounting Policy [Line Items]  
Estimated useful life 3 years
Furniture, fittings and equipment | Maximum  
Disclosure Of Material Accounting Policy [Line Items]  
Estimated useful life 5 years
Leasehold improvements  
Disclosure Of Material Accounting Policy [Line Items]  
Estimated useful life 5 years