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Financial risk management - Summary of hedging reserve (Details) - GBP (£)
£ in Thousands
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Financial risk management        
Cash flow hedge reserve £ 2,815 £ 950    
Cost of hedging reserve 1,187      
Total hedging reserve £ 4,002 £ 950 £ (10,436) £ (32,565)