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Treasury shares (Details) - GBP (£)
£ in Thousands, shares in Thousands
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Treasury shares, Value        
Value of shares £ (193,733) £ (144,890) £ (103,950) £ (127,508)
Treasury shares        
Treasury shares, Number of shares        
Number of shares 1,683 1,683    
Treasury shares, Value        
Value of shares £ 21,305 £ 21,305 £ 21,305 £ 21,305