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Share capital (Details)
 6 Months Ended
Dec. 31, 2020
GBP (£)
Vote
item
shares
Jun. 30, 2020
GBP (£)
shares
Dec. 31, 2019
GBP (£)
shares
Ordinary shares      
Balance at the beginning | £ £ 53,000 £ 53,000  
Balance at the end | £ £ 53,000 53,000 £ 53,000
Number of class of ordinary shares | item 2    
Number of class A shares to which one B share is convertible | shares 1    
Proportion of votes required for special resolutions 66.67%    
Treasury shares | £ £ 21,305,000 £ 21,305,000  
Ordinary shares      
Number of shares      
Balance at the beginning (in shares) | shares 164,622,000 164,573,000 164,571,000
Employee share-based compensation awards - issue of shares (in shares) | shares 0 49,000 2,000
Balance at the end (in shares) | shares 164,622,000 164,622,000 164,573,000
Ordinary shares      
Balance at the beginning | £ £ 53,000 £ 53,000 £ 53,000
Employee share-based compensation awards - issue of shares | £ 0 0 0
Balance at the end | £ £ 53,000 £ 53,000 £ 53,000
Class A ordinary shares      
Ordinary shares      
Number of voting right per share | Vote 1    
Number of shares issued | shares 40,622,089    
Number of shares purchased and held in treasury | shares 1,682,896    
Treasury shares | £ £ 21,305,000    
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 | shares 124,000,000