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Financial risk management - Hedging activities (Details)
£ in Thousands, $ in Thousands
Jun. 30, 2024
€ / £
Jun. 30, 2024
$ / £
Jun. 30, 2024
GBP (£)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
€ / £
Jun. 30, 2023
$ / £
Jun. 30, 2023
GBP (£)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
€ / £
Jun. 30, 2022
$ / £
Jun. 30, 2022
GBP (£)
Financial risk management activities                      
Net debt | £     £ 473,072       £ 537,277       £ 514,899
Closing exchange rate 1.1799 1.2643     1.1652 1.2716     1.1630 1.2151  
US dollar                      
Financial risk management activities                      
Net debt       $ 640,500       $ 592,500      
Hedged future USD revenues       (172,500)       (52,000)      
Unhedged USD borrowings       468,000       540,500      
Borrowings | US dollar                      
Financial risk management activities                      
Net debt       650,000       650,000      
Cash and cash equivalents                      
Financial risk management activities                      
Net debt | £     £ (73,549)       £ (76,019)       £ (121,223)
Cash and cash equivalents | US dollar                      
Financial risk management activities                      
Net debt       $ (9,500)       $ (57,500)