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Financial risk management - Summary of hedging reserve (Details) - GBP (£)
£ in Thousands
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Financial risk management        
Cash flow hedge reserve £ 723 £ (1,882)    
Cost of hedging reserve (500) 882    
Total hedging reserve £ 223 £ (1,000) £ 4,002 £ 950