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Loss per share (Details)
£ / shares in Units, £ in Thousands, shares in Thousands
 12 Months Ended
Jun. 30, 2025
GBP (£)
£ / shares
item
shares
Jun. 30, 2024
GBP (£)
£ / shares
shares
Jun. 30, 2023
GBP (£)
£ / shares
shares
Loss per share      
Loss for the year | £ £ (33,023) £ (113,159) £ (28,678)
Basic loss per share | £ / shares £ (0.1932) £ (0.6844) £ (0.1759)
Diluted loss per share | £ / shares [1] £ (0.1932) £ (0.6844) £ (0.1759)
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 170,931 165,345 163,062
Weighted average number of ordinary shares and potential ordinary shares used as the denominator in calculating diluted loss per share 170,931 165,345 163,062
Class A ordinary shares      
Loss per share      
Weighted average number of ordinary shares used as the denominator in calculating basic loss per share 57,225 56,091 54,537
Class B ordinary shares      
Loss per share      
Weighted average number of ordinary shares used as the denominator in calculating basic loss per share 115,389 110,937 110,208
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 2025, 2024 and 2023, 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.