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Income tax credit/(expense) - Current tax and Deferred tax (Details) - GBP (£)
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Current tax:      
Total current tax credit/(expense) £ 4,682,000 £ (4,170,000) £ (989,000)
Deferred tax:      
Total deferred tax credit/(expense) 29,431,000 (64,019,000) (1,426,000)
Total tax expense      
Total income tax credit/(expense) 34,113,000 (68,189,000) (2,415,000)
UK and US      
Current tax:      
Current tax on loss for the year 5,084,000 (3,972,000) 551,000
Adjustment in respect of previous years 223,000 490,000 (598,000)
US      
Deferred tax:      
Origination and reversal of temporary differences   3,831,000 4,591,000
Re-measurement of US deferred tax asset   (66,561,000) (3,916,000)
Adjustment in respect of previous years   973,000 (1,150,000)
Total deferred tax credit/(expense)   (61,757,000) (475,000)
UK      
Deferred tax:      
Origination and reversal of temporary differences 29,142,000 9,762,000 2,452,000
Adjustment in respect of previous years 289,000 (800,000) 512,000
Impact of change in corporate income tax rate   (11,224,000) (3,915,000)
Total deferred tax credit/(expense) 29,431,000 (2,262,000) (951,000)
Other than UK and US      
Current tax:      
Current tax on loss for the year £ (625,000) £ (688,000) £ (942,000)