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Income tax credit - Reconciliation of total income tax credit (Details) - GBP (£)
12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Reconciliation of the total tax expense      
Loss before income tax £ (39,664,000) £ (130,724,000) £ (32,574,000)
Loss before tax multiplied by UK corporation tax rate of 25.0% (2024: 25.0% - UK corporation tax rate; 2023: 20.5% - weighted average UK corporation tax rate) 9,916,000 32,681,000 6,678,000
Tax effects of:      
Adjustment in respect of previous years (284,000) (82,000) (491,000)
Expenses not deductible for tax purposes (2,080,000) (13,287,000) (2,650,000)
Irrecoverable foreign tax credits (911,000) (1,747,000) (572,000)
Impact of change in UK Corporation tax rate     931,000
Total income tax credit £ 6,641,000 £ 17,565,000 £ 3,896,000
UK      
Tax effects of:      
Corporate tax rate 25.00% 25.00% 20.50%
Deferred tax rate     25.00%