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Income tax credit - Current tax and Deferred tax (Details) - GBP (£)
£ in Thousands
 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Current tax      
Total current tax expense £ (1,087) £ (1,994) £ (905)
Deferred tax      
Total deferred tax credit 7,728 19,559  
Total tax expense      
Total income tax credit 6,641 17,565 3,896
UK and US      
Current tax      
Current tax on loss for the year (230) (270) (217)
Adjustment in respect of previous years 54 23 (116)
UK      
Deferred tax      
Origination and reversal of temporary differences 8,066 19,663 5,176
Adjustment in respect of previous years (338) (104) (375)
Total deferred tax credit 7,728 19,559 4,801
Other than UK and US      
Current tax      
Current tax on loss for the year £ (911) £ (1,747) £ (572)