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Income tax credit/(expense) - Current tax and Deferred tax (Details) - GBP (£)
£ in Thousands
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Current tax:      
Total current tax (expense)/credit £ (905) £ 4,682 £ (4,170)
Deferred tax:      
Total deferred tax credit/(expense) 4,801 29,431 (64,019)
Total tax expense      
Total income tax credit/(expense) 3,896 34,113 (68,189)
UK and US      
Current tax:      
Current tax on loss for the year (217) 5,084 (3,972)
Adjustment in respect of previous years (116) 223 490
US      
Deferred tax:      
Origination and reversal of temporary differences     3,831
Re-measurement of US deferred tax asset     (66,561)
Adjustment in respect of previous years     973
Total deferred tax credit/(expense)     (61,757)
UK      
Deferred tax:      
Origination and reversal of temporary differences 5,176 29,142 9,762
Adjustment in respect of previous years (375) 289 (800)
Impact of change in corporate income tax rate     (11,224)
Total deferred tax credit/(expense) 4,801 29,431 (2,262)
Other than UK and US      
Current tax:      
Current tax on loss for the year £ (572) £ (625) £ (688)