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Financial risk management - Hedging activities (Details)
£ in Thousands, $ in Thousands
Jun. 30, 2025
€ / £
Jun. 30, 2025
$ / £
Jun. 30, 2025
GBP (£)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
€ / £
Jun. 30, 2024
$ / £
Jun. 30, 2024
GBP (£)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
€ / £
Jun. 30, 2023
$ / £
Jun. 30, 2023
GBP (£)
Financial risk management activities                      
Net debt | £     £ 550,869       £ 473,072       £ 537,277
Closing exchange rate 1.1667 1.3709     1.1799 1.2643     1.1652 1.2716  
US dollar                      
Financial risk management activities                      
Net debt       $ 617,500       $ 640,500      
Hedged future USD revenues       (250,000)       (172,500)      
Unhedged USD borrowings       367,500       468,000      
Borrowings | US dollar                      
Financial risk management activities                      
Net debt       650,000       650,000      
Cash and cash equivalents                      
Financial risk management activities                      
Net debt | £     £ (86,105)       £ (73,549)       £ (76,019)
Cash and cash equivalents | US dollar                      
Financial risk management activities                      
Net debt       $ (32,500)       $ (9,500)