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Financial risk management - Hedging activities (Details)
£ in Thousands, $ in Thousands
Jun. 30, 2020
USD ($)
Jun. 30, 2020
$ / £
Jun. 30, 2020
€ / £
Jun. 30, 2020
GBP (£)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
$ / £
Jun. 30, 2019
€ / £
Jun. 30, 2019
GBP (£)
Jun. 30, 2018
$ / £
Jun. 30, 2018
€ / £
Jun. 30, 2018
GBP (£)
Financial risk management activities                      
Net debt | £       £ 474,076       £ 203,595     £ 253,746
Closing exchange rate   1.2374 1.0998     1.2718 1.1170   1.3194 1.1309  
US dollar                      
Financial risk management activities                      
Net debt $ 646,975       $ 341,162            
Hedged future USD revenues (177,524)       (211,153)            
Unhedged USD borrowings 469,451       130,009            
Borrowings | US dollar                      
Financial risk management activities                      
Net debt 650,000       650,000            
Cash and cash equivalents                      
Financial risk management activities                      
Net debt | £       £ (51,539)       £ (307,637)     £ (242,022)
Cash and cash equivalents | US dollar                      
Financial risk management activities                      
Net debt $ (3,025)       $ (308,838)