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Ordinary dividends (Details) - £ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Interim period amount      
Disclosure of Dividends [line items]      
Dividends declared (pound per share) £ 0.075 £ 0.150  
Previous period final amount      
Disclosure of Dividends [line items]      
Dividends declared (pound per share)     £ 0.244