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Borrowings (Details)
6 Months Ended 12 Months Ended
Dec. 31, 2018
GBP (£)
Jun. 30, 2018
GBP (£)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
GBP (£)
Jul. 09, 2018
Jun. 30, 2018
USD ($)
Jun. 30, 2018
GBP (£)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
GBP (£)
Jun. 30, 2017
GBP (£)
Disclosure of detailed information about borrowings                    
Total borrowings       £ 508,068,000     £ 495,768,000   £ 483,908,000  
Non-current borrowings       502,576,000     486,694,000   474,748,000 £ 497,630,000
Current borrowings       5,492,000     9,074,000   9,160,000 £ 5,724,000
Senior secured notes                    
Disclosure of detailed information about borrowings                    
Total borrowings       328,696,000     318,347,000   310,570,000  
Non-current borrowings       328,696,000     318,347,000   310,570,000  
Unamortized issue costs on borrowings       3,594,000     3,770,000   3,943,000  
Principal amount / Notional amount | $     $ 425,000,000     $ 425,000,000   $ 425,000,000    
Secured term loan facility                    
Disclosure of detailed information about borrowings                    
Total borrowings       173,880,000     168,347,000   164,178,000  
Non-current borrowings       173,880,000     168,347,000   164,178,000  
Unamortized issue costs on borrowings       2,040,000     2,185,000   2,328,000  
Principal amount / Notional amount | $     $ 225,000,000     $ 225,000,000   $ 225,000,000    
Secured bank loan                    
Disclosure of detailed information about borrowings                    
Total borrowings             3,750,000   3,962,000  
Accrued interest on senior secured notes                    
Disclosure of detailed information about borrowings                    
Total borrowings       5,492,000     5,324,000   5,198,000  
Undrawn committed revolving borrowing facility                    
Disclosure of detailed information about borrowings                    
Undrawn committed revolving borrowings facility       125,000,000     £ 125,000,000   £ 125,000,000  
Incremental borrowings       £ 25,000,000            
Amount drawn down from borrowing facilities £ 0 £ 0                
Fixed interest rate | Senior secured notes                    
Disclosure of detailed information about borrowings                    
Borrowings, interest rate     3.79% 3.79%            
Floating interest rate | Secured term loan facility                    
Disclosure of detailed information about borrowings                    
Borrowings, interest rate basis US dollar LIBOR                  
Floating interest rate | Secured bank loan                    
Disclosure of detailed information about borrowings                    
Borrowings, interest rate basis LIBOR                  
Adjustment to interest rate basis         1.00%          
Floating interest rate | Undrawn committed revolving borrowing facility                    
Disclosure of detailed information about borrowings                    
Borrowings, interest rate basis LIBOR or EURIBOR                  
Minimum | Floating interest rate | Secured term loan facility                    
Disclosure of detailed information about borrowings                    
Adjustment to interest rate basis     1.25% 1.25%            
Minimum | Floating interest rate | Undrawn committed revolving borrowing facility                    
Disclosure of detailed information about borrowings                    
Adjustment to interest rate basis     1.25% 1.25%            
Maximum | Floating interest rate | Secured term loan facility                    
Disclosure of detailed information about borrowings                    
Adjustment to interest rate basis     1.75% 1.75%            
Maximum | Floating interest rate | Undrawn committed revolving borrowing facility                    
Disclosure of detailed information about borrowings                    
Adjustment to interest rate basis     1.75% 1.75%