v3.25.2
Derivative Financial Instruments - Additional Information (Detail)
£ / shares in Units, £ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2025
GBP (£)
shares
May 31, 2025
GBP (£)
warrant
£ / shares
shares
Jun. 30, 2025
GBP (£)
£ / shares
shares
Jun. 30, 2025
GBP (£)
Jun. 30, 2024
GBP (£)
Disclosure of financial liabilities [line items]          
Initial proceeds from exercise Of warrants | £   £ 5,200      
Number of ADS receive per warrant | warrant   3      
Proceeds from exercise of warrants | £       £ 4,436 £ 0
Proceeds from exercise of options | £       1 £ 3
ADS [Member]          
Disclosure of financial liabilities [line items]          
Number oI instrument issued in direct offering | shares   2,452,935      
Number of ordinary shares representing instruments | shares   61,323,375      
PreFunded Warrant [Member]          
Disclosure of financial liabilities [line items]          
Number oI instrument issued in direct offering | shares   8,393,050      
Number of ordinary shares representing instruments | shares   209,826,250      
Proceeds from exercise of warrants | £   £ 4,400      
Series B Warrants [Member]          
Disclosure of financial liabilities [line items]          
Number oI instrument issued in direct offering | shares     356,412,705    
Number of ordinary shares representing instruments | shares     8,901,317,625    
Exercise price, share options granted | £ / shares   £ 0 £ 0    
Proceeds from exercise of warrants | £   £ 100 £ 3,500    
Floor price of warrants | £ / shares   £ 0.1291      
Increase decrease in number of warrants | £ / shares   118,804,235      
Series B Warrants [Member] | Bottom of range [member]          
Disclosure of financial liabilities [line items]          
Exercise price of warrants | £ / shares   0.3643      
Series B Warrants [Member] | Top of range [member]          
Disclosure of financial liabilities [line items]          
Exercise price of warrants | £ / shares   £ 1.61      
Series A Warrants [Member]          
Disclosure of financial liabilities [line items]          
Number oI instrument issued in direct offering | shares 8,300,000        
Number of ordinary shares representing instruments | shares 207,500,000        
Proceeds from exercise of warrants | £ £ 800        
Proceeds from exercise of options | £ 14,500        
Floor price of warrants | £ / shares     £ 0.1291    
Increase decrease in number of warrants | £ / shares     £ 67,781,105    
Financial liabilities, at fair value | £ £ 2,600   £ 2,600 £ 2,600