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Financial risk management - Swaps (Details) - Interest rate swap
$ in Thousands
6 Months Ended
Dec. 31, 2023
GBP (£)
USD ($)
Jun. 30, 2023
GBP (£)
USD ($)
Dec. 31, 2022
GBP (£)
USD ($)
Financial risk management activities      
Fair value of interest rate swaps, asset | £ £ 2,211,000 £ 4,173,000 £ 4,901,000
Long position      
Financial risk management activities      
Principal value of loan outstanding | $ 150,000 150,000 150,000
Rate received 1 month $ SOFR 1 month $ SOFR 1 month $ LIBOR
Rate paid 1.9215% 1.9215% 2.032%