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Financial risk management - Swaps (Details) - Interest rate swap
$ in Thousands
12 Months Ended
Jun. 30, 2022
GBP (£)
USD ($)
Jun. 30, 2021
GBP (£)
USD ($)
Financial risk management activities    
Fair value of interest rate swaps, asset £ 2,458,000  
Fair value of interest rate swaps, liability   £ 5,121,000
Long position    
Financial risk management activities    
Principal value of loan outstanding | $ 150,000 150,000
Rate received 1 month $ LIBOR 1 month $ LIBOR
Rate paid 2.032% 2.032%