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Income tax credit/(expense) - Reconciliation of total tax credit/(expense) (Details) - GBP (£)
1 Months Ended 12 Months Ended
Apr. 30, 2023
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Reconciliation of the total tax expense        
Loss before income tax   £ (32,574,000) £ (149,623,000) £ (24,027,000)
Loss before tax multiplied by weighted average UK corporation tax rate of 20.5% (2022: 19.0% - UK corporation tax rate; 2021: 21.0% - weighted average US federal corporate income tax rate)   6,678,000 28,428,000 5,046,000
Tax effects of:        
Adjustment in respect of previous years   (491,000) 512,000 663,000
Difference in tax rates on non-US operations       216,000
Foreign exchange losses on US dollar denominated tax basis       (3,146,000)
Expenses not deductible for tax purposes   (2,650,000) (1,197,000) (526,000)
Irrecoverable foreign tax credits   (572,000) (625,000)  
Impact of change in UK Corporation tax rate   931,000 6,995,000 (77,785,000)
Unrealized foreign exchange gains not taxable in the US       7,343,000
Total income tax credit/(expense)   £ 3,896,000 £ 34,113,000 £ (68,189,000)
US        
Tax effects of:        
Corporate tax rate   21.00%   21.00%
UK        
Tax effects of:        
Corporate tax rate 25.00% 20.50% 19.00%  
Deferred tax rate   25.00%