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Income tax credit/(expense) - Current tax and Deferred tax (Details) - GBP (£)
£ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Jun. 30, 2025
Jun. 30, 2024
Current tax            
Total current tax expense £ (770) £ (651) £ (838) £ (836)    
Deferred tax            
Origination and reversal of temporary differences 7,542 (6,194) 7,311 1,038    
Total deferred tax credit/(expense) 7,542 (6,194) 7,311 1,038   £ 19,559
Total tax expense            
Total income credit/(expense) 6,772 (6,845) 6,473 202    
Weighted average annual tax rate           14.84%
Forecast            
Total tax expense            
Weighted average annual tax rate         21.91%  
UK and US            
Current tax            
Current tax on loss for the period (38) (89) £ (105) (160)    
UK            
Total tax expense            
Corporate tax rate     25.00%      
Other than UK and US            
Current tax            
Current tax on loss for the period £ (732) £ (562) £ (733) £ (676)