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Financial risk management - Hedging activities (Details)
£ in Thousands, $ in Thousands
Jun. 30, 2019
USD ($)
Jun. 30, 2019
$ / £
Jun. 30, 2019
€ / £
Jun. 30, 2019
GBP (£)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
$ / £
Jun. 30, 2018
€ / £
Jun. 30, 2018
GBP (£)
Jun. 30, 2017
$ / £
Jun. 30, 2017
€ / £
Jun. 30, 2017
GBP (£)
Financial risk management activities                      
Net debt | £       £ 203,595       £ 253,746     £ 213,087
Closing exchange rate   1.2718 1.1170     1.3194 1.1309   1.2988 1.1379  
US dollar                      
Financial risk management activities                      
Net debt $ 341,162       $ 521,500            
Hedged future USD revenues (211,153)       (307,019)            
Unhedged USD borrowings 130,009       214,481            
Borrowings | US dollar                      
Financial risk management activities                      
Net debt 650,000       650,000            
Cash and cash equivalents                      
Financial risk management activities                      
Net debt | £       £ (307,637)       £ (242,022)     £ (290,267)
Cash and cash equivalents | US dollar                      
Financial risk management activities                      
Net debt $ (308,838)       $ (128,500)