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Derivative financial instruments (Details) - GBP (£)
£ in Thousands
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments      
Derivative financial instruments, assets   £ 342 £ 3,184
Derivative financial instruments, liabilities £ (2,554) (2,298)  
Derivative financial instruments, non-current assets   30 2,559
Derivative financial instruments, non-current liabilities (2,323) (2,298)  
Derivative financial instruments, current assets   312 625
Derivative financial instruments, current liabilities (231)    
Interest rate swap | Derivatives used for hedging:      
Disclosure of detailed information about financial instruments      
Derivative financial instruments, assets     2,504
Derivative financial instruments, non-current assets     2,504
Embedded foreign exchange derivatives | At fair value through profit and loss      
Disclosure of detailed information about financial instruments      
Derivative financial instruments, assets   245 680
Derivative financial instruments, non-current assets   30 £ 55
Forward foreign currency contracts | At fair value through profit and loss      
Disclosure of detailed information about financial instruments      
Derivative financial instruments, assets   97  
Interest rate swap | Derivatives used for hedging:      
Disclosure of detailed information about financial instruments      
Derivative financial instruments, liabilities (2,317) (2,298)  
Derivative financial instruments, non-current liabilities (2,317) £ (2,298)  
Embedded foreign exchange derivatives | At fair value through profit and loss:      
Disclosure of detailed information about financial instruments      
Derivative financial instruments, liabilities (101)    
Forward foreign currency contracts | At fair value through profit and loss:      
Disclosure of detailed information about financial instruments      
Derivative financial instruments, liabilities (136)    
Derivative financial instruments, non-current liabilities £ (6)