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Share capital (Details)
£ in Thousands
 6 Months Ended
Dec. 31, 2018
GBP (£)
Vote
item
shares
Jun. 30, 2018
GBP (£)
shares
Dec. 31, 2017
GBP (£)
shares
Dec. 31, 2018
$ / shares
shares
Ordinary shares        
Balance at the beginning | £ £ 53 £ 53 £ 53  
Balance at the end | £ £ 53 £ 53 £ 53  
Number of class of ordinary shares | item 2      
Number of class A shares to which one B share is convertible 1      
Proportion of votes required for special resolutions 66.67%      
Ordinary shares        
Number of shares        
Balance at the beginning (in shares) 164,526,000 164,195,000 164,195,000  
Employee share-based compensation awards - issue of shares (in shares) 0 331,000 0  
Balance at the end (in shares) 164,526,000 164,526,000 164,195,000  
Ordinary shares        
Balance at the beginning | £ £ 53 £ 53 £ 53  
Employee share-based compensation awards - issue of shares | £ 0 0 0  
Balance at the end | £ £ 53 £ 53 £ 53  
Class A ordinary shares        
Ordinary shares        
Par value per ordinary share (in dollars per share) | $ / shares       $ 0.0005
Number of voting right per share | Vote 1      
Number of shares issued       40,526,390
Class B ordinary shares        
Ordinary shares        
Par value per ordinary share (in dollars per share) | $ / shares       $ 0.0005
Number of voting right per share | Vote 10      
Percentage of ordinary shares outstanding below which Class B shares will convert to Class A 10.00%      
Percentage of voting power of shareholders 67.00%      
Number of shares issued       124,000,000