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Additional information - Financial Statement Schedule I - Reconciliations (Details) - GBP (£)
£ in Thousands
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
IFRS (loss)/profit reconciliation:        
Additional loss if subsidiaries had been accounted for on the equity method of accounting as opposed to cost £ (15,003) £ (144,861) £ (98,680)  
(Loss)/profit for the year (28,678) (115,510) (92,216)  
IFRS equity reconciliation:        
Additional (loss)/profit if subsidiaries had been accounted for on the equity method of accounting as opposed to cost (189,807) (178,171) (37,171)  
IFRS equity 103,950 127,508 272,512 £ 351,232
Parent        
IFRS (loss)/profit reconciliation:        
(Loss)/profit for the year (13,675) 29,351 6,464  
IFRS equity reconciliation:        
IFRS equity £ 293,757 £ 305,679 £ 309,683 £ 311,852