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Income tax expense - Current tax and Deferred tax (Details) - GBP (£)
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Current tax      
Total current tax expense £ (4,170,000) £ (989,000) £ (483,000)
Deferred tax      
Total deferred tax expense (64,019,000) (1,426,000) (8,112,000)
Total tax expense      
Total income tax expense (68,189,000) (2,415,000) (8,595,000)
UK and US      
Current tax      
Current tax on loss/profit for the year (3,972,000) 551,000 (498,000)
Adjustment in respect of previous years 490,000 (598,000) 229,000
US      
Deferred tax      
Origination and reversal of temporary differences 3,831,000 4,591,000 (3,452,000)
Re-measurement of US deferred tax asset (66,561,000) (3,916,000)  
Adjustment in respect of previous years 973,000 (1,150,000) 776,000
Total deferred tax expense (61,757,000) (475,000) (2,676,000)
UK      
Deferred tax      
Origination and reversal of temporary differences 9,762,000 2,452,000 (5,515,000)
Adjustment in respect of previous years (800,000) 512,000 79,000
Impact of change in corporate income tax rate (11,224,000) (3,915,000)  
Total deferred tax expense (2,262,000) (951,000) (5,436,000)
Other than UK and US      
Current tax      
Current tax on loss/profit for the year £ (688,000) £ (942,000) £ (214,000)