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Financial risk management - Summary of hedging reserve (Details) - GBP (£)
£ in Thousands
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Financial risk management        
Cash flow hedge reserve £ (1,882) £ 2,815    
Cost of hedging reserve 882 1,187    
Total hedging reserve £ (1,000) £ 4,002 £ 950 £ (10,436)