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Financial risk management - Summary of hedging reserve (Details) - GBP (£)
£ in Thousands
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Financial risk management      
Cash flow hedge reserve £ (3,420) £ (1,882) £ 1,521
Cost of hedging reserve (122) 882 (1,546)
Total hedging reserve £ (3,542) £ (1,000) £ (25)