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Deferred tax - Movements in net deferred tax asset/(liability) (Details) - GBP (£)
 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Movements in net deferred tax asset      
Net deferred tax assets/(liabilities) at beginning of year £ 17,607,000 £ (3,304,000)  
(Expensed)/credited to statement of profit or loss (Note 10) 7,728,000 19,559,000  
Credited/(expensed) to other comprehensive income (Note 10) (408,000) 1,667,000  
Expense relating to share-based payments   (315,000)  
Net deferred tax assets/(liabilities) at end of year 24,927,000 17,607,000 £ (3,304,000)
US      
Movements in net deferred tax asset      
Unrecognised deferred tax assets 97,278,000 94,280,000  
US | Net operating losses and interest restriction      
Movements in net deferred tax asset      
Net deferred tax assets/(liabilities) at beginning of year 4,277,000 6,976,000  
(Expensed)/credited to statement of profit or loss (Note 10) 15,144,000 (2,699,000)  
Net deferred tax assets/(liabilities) at end of year 19,421,000 4,277,000 6,976,000
Unrecognised deferred tax assets 69,274,000    
US | Unrealized foreign exchange and derivative movements      
Movements in net deferred tax asset      
Net deferred tax assets/(liabilities) at beginning of year   (2,796,000)  
(Expensed)/credited to statement of profit or loss (Note 10)   2,796,000  
Net deferred tax assets/(liabilities) at end of year     (2,796,000)
US | Property, plant and equipment      
Movements in net deferred tax asset      
Net deferred tax assets/(liabilities) at beginning of year (4,277,000) (4,180,000)  
(Expensed)/credited to statement of profit or loss (Note 10) 65,000 (97,000)  
Net deferred tax assets/(liabilities) at end of year (4,212,000) (4,277,000) (4,180,000)
US | Foreign tax credits      
Movements in net deferred tax asset      
(Expensed)/credited to statement of profit or loss (Note 10) (15,209,000)    
Net deferred tax assets/(liabilities) at end of year (15,209,000)    
Unrecognised deferred tax assets 13,547,000    
US | General accruals not paid within 8.5 months of year end      
Movements in net deferred tax asset      
Unrecognised deferred tax assets 5,291,000    
US | Salary not paid with 2.5 months of year end      
Movements in net deferred tax asset      
Unrecognised deferred tax assets 2,230,000    
US | Research and development      
Movements in net deferred tax asset      
Unrecognised deferred tax assets 2,511,000    
US | Other      
Movements in net deferred tax asset      
Unrecognised deferred tax assets 4,425,000    
UK      
Movements in net deferred tax asset      
Net deferred tax assets/(liabilities) at beginning of year 17,607,000 (3,304,000)  
(Expensed)/credited to statement of profit or loss (Note 10) 7,728,000 19,559,000 4,801,000
Credited/(expensed) to other comprehensive income (Note 10) (408,000) 1,667,000 (1,018,000)
Expense relating to share-based payments   (315,000)  
Net deferred tax assets/(liabilities) at end of year 24,927,000 17,607,000 (3,304,000)
Unrecognised deferred tax assets 0 0  
UK | Accelerated tax depreciation      
Movements in net deferred tax asset      
Net deferred tax assets/(liabilities) at beginning of year (3,459,000) (1,602,000)  
(Expensed)/credited to statement of profit or loss (Note 10) (1,676,000) (1,857,000)  
Net deferred tax assets/(liabilities) at end of year (5,135,000) (3,459,000) (1,602,000)
UK | Intangible assets      
Movements in net deferred tax asset      
Net deferred tax assets/(liabilities) at beginning of year (22,582,000) (15,737,000)  
(Expensed)/credited to statement of profit or loss (Note 10) (4,677,000) (6,845,000)  
Net deferred tax assets/(liabilities) at end of year (27,259,000) (22,582,000) (15,737,000)
UK | Non qualifying property      
Movements in net deferred tax asset      
Net deferred tax assets/(liabilities) at beginning of year (17,467,000) (17,472,000)  
(Expensed)/credited to statement of profit or loss (Note 10) 5,000 5,000  
Net deferred tax assets/(liabilities) at end of year (17,462,000) (17,467,000) (17,472,000)
UK | Property fair value adjustment      
Movements in net deferred tax asset      
Net deferred tax assets/(liabilities) at beginning of year (15,549,000) (16,180,000)  
(Expensed)/credited to statement of profit or loss (Note 10) 631,000 631,000  
Net deferred tax assets/(liabilities) at end of year (14,918,000) (15,549,000) (16,180,000)
UK | Net operating losses      
Movements in net deferred tax asset      
Net deferred tax assets/(liabilities) at beginning of year 71,882,000 46,508,000  
(Expensed)/credited to statement of profit or loss (Note 10) 15,287,000 25,124,000  
Credited/(expensed) to other comprehensive income (Note 10) (132,000) 250,000  
Net deferred tax assets/(liabilities) at end of year 87,037,000 71,882,000 46,508,000
UK | Other      
Movements in net deferred tax asset      
Net deferred tax assets/(liabilities) at beginning of year 4,782,000 1,179,000  
(Expensed)/credited to statement of profit or loss (Note 10) (1,842,000) 2,501,000  
Credited/(expensed) to other comprehensive income (Note 10) (276,000) 1,417,000  
Expense relating to share-based payments   (315,000)  
Net deferred tax assets/(liabilities) at end of year 2,664,000 £ 4,782,000 £ 1,179,000
UK | Due after 1 year      
Movements in net deferred tax asset      
Net deferred tax assets/(liabilities) at end of year £ 24,927,000