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Additional information-Financial Statement Schedule I - Reconciliations (Details) - GBP (£)
£ in Thousands
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
IFRS profit/(loss) reconciliation:        
Additional (loss)/profit if subsidiaries had been accounted for on the equity method of accounting as opposed to cost £ (64,876) £ (990) £ (56,188)  
(Loss)/profit for the year (23,233) 18,881 (37,629)  
IFRS equity reconciliation:        
Additional profit if subsidiaries had been accounted for on the equity method of accounting as opposed to cost 39,380 101,277 110,423  
IFRS equity 351,232 415,202 427,104 £ 480,087
Parent        
IFRS profit/(loss) reconciliation:        
(Loss)/profit for the year 41,643 19,871 18,559  
IFRS equity reconciliation:        
IFRS equity £ 311,852 £ 313,925 £ 316,681 £ 317,189