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Financial risk management - Hedging activities (Details)
£ in Thousands, $ in Thousands
Jun. 30, 2023
€ / £
Jun. 30, 2023
$ / £
Jun. 30, 2023
GBP (£)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
€ / £
Jun. 30, 2022
$ / £
Jun. 30, 2022
GBP (£)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
€ / £
Jun. 30, 2021
$ / £
Jun. 30, 2021
GBP (£)
Financial risk management activities                      
Net debt | £     £ 537,277       £ 514,899       £ 419,578
Closing exchange rate 1.1652 1.2716     1.1630 1.2151     1.1651 1.3820  
US dollar                      
Financial risk management activities                      
Net debt       $ 592,500       $ 613,000      
Hedged future USD revenues       (52,000)       (22,800)      
Unhedged USD borrowings       540,500       590,200      
Borrowings | US dollar                      
Financial risk management activities                      
Net debt       650,000       650,000      
Cash and cash equivalents                      
Financial risk management activities                      
Net debt | £     £ (76,019)       £ (121,223)       £ (110,658)
Cash and cash equivalents | US dollar                      
Financial risk management activities                      
Net debt       $ (57,500)       $ (37,000)