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Additional information - Financial Statement Schedule I - Reconciliations (Details) - GBP (£)
£ in Thousands
 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
IFRS (loss)/profit reconciliation:        
Additional loss if subsidiaries had been accounted for on the equity method of accounting as opposed to cost £ (61,478) £ (15,003) £ (144,861)  
(Loss)/profit for the year (113,159) (28,678) (115,510)  
IFRS equity reconciliation:        
Additional loss if subsidiaries had been accounted for on the equity method of accounting as opposed to cost (256,603) (189,807) (178,171)  
IFRS equity 144,890 103,950 127,508 £ 272,512
Parent        
IFRS (loss)/profit reconciliation:        
(Loss)/profit for the year (51,681) (13,675) 29,351  
IFRS equity reconciliation:        
IFRS equity £ 401,493 £ 293,757 £ 305,679 £ 309,683