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Share capital (Details)
£ in Thousands
 6 Months Ended
Dec. 31, 2019
GBP (£)
Vote
item
shares
Jun. 30, 2019
GBP (£)
shares
Dec. 31, 2018
GBP (£)
shares
Ordinary shares      
Balance at the beginning | £ £ 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) 164,571,000 164,526,000 164,526,000
Employee share-based compensation awards - issue of shares (in shares) 2,000 45,000 0
Balance at the end (in shares) 164,573,000 164,571,000 164,526,000
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      
Number of voting right per share | Vote 1    
Number of shares issued 40,572,687    
Class B ordinary shares      
Ordinary shares      
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