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Earnings per share (Details)
£ / shares in Units, £ in Thousands, shares in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2020
GBP (£)
£ / shares
item
shares
Dec. 31, 2019
GBP (£)
£ / shares
shares
Dec. 31, 2020
GBP (£)
£ / shares
item
shares
Jun. 30, 2020
GBP (£)
Dec. 31, 2019
GBP (£)
£ / shares
shares
Earnings per share          
Profit for the period | £ £ 63,828 £ 35,007 £ 33,558 £ (59,368) £ 36,135
Basic earnings per share | £ / shares £ 0.3917 £ 0.2127 £ 0.2060   £ 0.2196
Diluted earnings per share | £ / shares £ 0.3907 £ 0.2125 £ 0.2054   £ 0.2194
Number of categories of dilutive potential ordinary shares | item 1   1    
Weighted average number of ordinary shares used as the denominator in calculating basic earnings per share 162,939 164,573 162,939   164,573
Weighted average number of ordinary shares and potential ordinary shares used as the denominator in calculating diluted earnings per share 163,385 164,746 163,385   164,737
Class A ordinary shares          
Earnings per share          
Weighted average number of ordinary shares used as the denominator in calculating basic earnings per share 40,622 40,573 40,622   40,573
Adjustment for calculation of diluted earnings per share assumed conversion into Class A ordinary shares 446 173 446   164
Class B ordinary shares          
Earnings per share          
Weighted average number of ordinary shares used as the denominator in calculating basic earnings per share 124,000 124,000 124,000   124,000
Treasury shares          
Earnings per share          
Weighted average number of ordinary shares used as the denominator in calculating basic earnings per share 1,683   1,683