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Income tax credit - Additional information related to tax (Details) - GBP (£)
£ in Thousands
12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Income tax      
Deferred tax (Note 17) £ (408) £ 1,667  
Total income tax (expense)/credit recognized in other comprehensive (loss)/income £ (408) 1,667 £ (1,018)
Minimum      
Income tax      
Pillar Two effective tax rates in jurisdictions in which Group operates 15.00%    
UK      
Income tax      
Deferred tax (Note 17) £ (408) £ 1,667 £ (1,018)