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Derivative financial instruments (Details) - GBP (£)
£ in Thousands
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Disclosure of detailed information about financial instruments        
Derivative financial instruments, assets £ 3,184 £ 5,966 £ 3,896  
Derivative financial instruments, non-current assets 2,559 4,807 1,192 £ 1,666
Derivative financial instruments, non-current liabilities       (655)
Derivative financial instruments, current assets 625 1,159 2,704 3,218
Derivative financial instruments, current liabilities       £ (1,253)
Interest rate swap | Derivatives used for hedging:        
Disclosure of detailed information about financial instruments        
Derivative financial instruments, assets 2,504 4,490 907  
Derivative financial instruments, non-current assets 2,504 4,490 907  
Embedded foreign exchange derivatives | At fair value through profit and loss        
Disclosure of detailed information about financial instruments        
Derivative financial instruments, assets 680 624 869  
Derivative financial instruments, non-current assets £ 55 317 285  
Forward foreign currency contracts | At fair value through profit and loss        
Disclosure of detailed information about financial instruments        
Derivative financial instruments, assets   £ 852 £ 2,120