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Financial risk management - Hedging activities (Details)
£ in Thousands, $ in Thousands
Jun. 30, 2022
€ / £
Jun. 30, 2022
$ / £
Jun. 30, 2022
GBP (£)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
€ / £
Jun. 30, 2021
$ / £
Jun. 30, 2021
GBP (£)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
€ / £
Jun. 30, 2020
$ / £
Jun. 30, 2020
GBP (£)
Financial risk management activities                      
Net debt | £     £ 514,899       £ 419,578       £ 474,076
Closing exchange rate 1.1630 1.2151     1.1651 1.3820     1.0998 1.2374  
US dollar                      
Financial risk management activities                      
Net debt       $ 613,000       $ 626,300      
Hedged future USD revenues       (22,800)       (61,453)      
Unhedged USD borrowings       590,200       564,847      
Borrowings | US dollar                      
Financial risk management activities                      
Net debt       650,000       650,000      
Cash and cash equivalents                      
Financial risk management activities                      
Net debt | £     £ (121,223)       £ (110,658)       £ (51,539)
Cash and cash equivalents | US dollar                      
Financial risk management activities                      
Net debt       $ (37,000)       $ (23,700)