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Additional information - Financial Statement Schedule I - Reconciliations (Details) - GBP (£)
£ in Thousands
12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
IFRS loss reconciliation:        
Additional loss if subsidiaries had been accounted for on the equity method of accounting as opposed to cost £ (32,124) £ (61,478) £ (15,003)  
Loss for the year (33,023) (113,159) (28,678)  
IFRS equity reconciliation:        
Additional loss if subsidiaries had been accounted for on the equity method of accounting as opposed to cost (287,504) (256,603) (189,807)  
IFRS equity 193,733 144,890 103,950 £ 127,508
Parent        
IFRS loss reconciliation:        
Loss for the year (899) (51,681) (13,675)  
IFRS equity reconciliation:        
IFRS equity £ 481,237 £ 401,493 £ 293,757 £ 305,679