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Income tax credit - Reconciliation of total tax credit/(expense) (Details) - GBP (£)
1 Months Ended 12 Months Ended
Apr. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Reconciliation of the total tax expense        
Loss before income tax   £ (130,724,000) £ (32,574,000) £ (149,623,000)
Loss before tax multiplied by weighted average UK corporation tax rate of 25.0% (2023: 20.5% - UK corporation tax rate; 2022: 19.0% - weighted average US federal corporate income tax rate)   32,681,000 6,678,000 28,428,000
Tax effects of:        
Adjustment in respect of previous years   (82,000) (491,000) 512,000
Expenses not deductible for tax purposes   (13,287,000) (2,650,000) (1,197,000)
Irrecoverable foreign tax credits   (1,747,000) (572,000) (625,000)
Impact of change in UK Corporation tax rate     931,000 6,995,000
Total income tax credit   £ 17,565,000 £ 3,896,000 £ 34,113,000
US        
Tax effects of:        
Corporate tax rate       19.00%
UK        
Tax effects of:        
Corporate tax rate 25.00% 25.00% 20.50% 19.00%
Deferred tax rate     25.00%