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Earnings/(loss) per share (Details)
£ / shares in Units, £ in Thousands, shares in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2018
GBP (£)
£ / shares
item
shares
Dec. 31, 2017
GBP (£)
£ / shares
shares
Dec. 31, 2018
GBP (£)
£ / shares
item
shares
Dec. 31, 2017
GBP (£)
£ / shares
shares
Earnings/(loss) per share        
Profit/(loss) for the period | £ £ 26,770 £ (19,697) [1] £ 33,416 £ (10,127) [1]
Profit/(loss) for the period | £ £ 26,770 £ (19,697) [1] £ 33,416 £ (10,127) [1]
Basic earnings/(loss) per share | £ / shares £ 0.1627 £ (0.1200) [1] £ 0.2031 £ (0.0617) [1]
Diluted earnings/(loss) per share | £ / shares [2] £ 0.1626 £ (0.1200) [1] £ 0.2029 £ (0.0617) [1]
Number of categories of dilutive potential ordinary shares | item 1   1  
Class A ordinary shares        
Earnings/(loss) per share        
Weighted average number of ordinary shares outstanding, basic 40,526 40,195 40,526 40,195
Adjustment for assumed conversion into Class A ordinary shares 137 390 137 390
Class B ordinary shares        
Earnings/(loss) per share        
Weighted average number of ordinary shares outstanding, basic 124,000 124,000 124,000 124,000
[1] Comparative amounts have been restated - see note 34 to the interim consolidated financial statements for further details.
[2] For the three and six months ended 31 December 2017 potential ordinary shares are anti-dilutive, as their inclusion in the diluted loss per share calculation would reduce their loss per share, and hence have been excluded.