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Loss per share (Details)
£ / shares in Units, £ in Thousands, shares in Thousands
 12 Months Ended
Jun. 30, 2023
GBP (£)
£ / shares
item
shares
Jun. 30, 2022
GBP (£)
£ / shares
shares
Jun. 30, 2021
GBP (£)
£ / shares
shares
Loss per share      
Loss for the year | £ £ (28,678) £ (115,510) £ (92,216)
Basic loss per share | £ / shares £ (0.1759) £ (0.7086) £ (0.5660)
Diluted loss per share | £ / shares [1] £ (0.1759) £ (0.7086) £ (0.5660)
Number of categories of dilutive potential ordinary shares | item 1    
Weighted average number of ordinary shares used as the denominator in calculating basic loss per share 163,062 163,001 162,939
Weighted average number of ordinary shares and potential ordinary shares used as the denominator in calculating diluted loss per share 163,062 163,001 162,939
Class A ordinary shares      
Loss per share      
Weighted average number of ordinary shares used as the denominator in calculating basic loss per share 54,537 51,952 41,939
Class B ordinary shares      
Loss per share      
Weighted average number of ordinary shares used as the denominator in calculating basic loss per share 110,208 112,732 122,683
Treasury shares      
Loss per share      
Weighted average number of ordinary shares used as the denominator in calculating basic loss per share 1,683 1,683 1,683
[1] For the years ended 30 June 2023, 2022 and 2021, potential ordinary shares are anti-dilutive, as their inclusion in the diluted loss per share calculation would reduce the loss per share, and hence have been excluded.