v3.26.1
Related party transactions - Transactions with Mudrick capital and Stephen Fitzpatrick (Details)
$ / shares in Units, £ in Thousands, $ in Millions
 1 Months Ended 12 Months Ended
Jan. 24, 2025
USD ($)
$ / shares
shares
Jan. 24, 2025
GBP (£)
shares
Jul. 31, 2025
USD ($)
shares
Jul. 31, 2025
GBP (£)
shares
Dec. 31, 2024
USD ($)
Dec. 31, 2024
GBP (£)
Dec. 31, 2025
GBP (£)
shares
Dec. 31, 2024
GBP (£)
Dec. 31, 2025
$ / shares
Dec. 23, 2024
Disclosure of transactions between related parties [line items]                    
Proceeds from issue of shares             £ 105,760      
Number of shares issued | shares             32,060,106      
Amount outstanding           £ 524,242 £ 188,526 £ 524,242    
Tranche A Warrant                    
Disclosure of transactions between related parties [line items]                    
Exercise price per share | $ / shares $ 6               $ 6  
Tranche B Warrant                    
Disclosure of transactions between related parties [line items]                    
Exercise price per share | $ / shares $ 7.5                  
Mudrick                    
Disclosure of transactions between related parties [line items]                    
Gross proceeds $ 25.0 £ 20,000                
Issuance of units | shares 4,166,666 4,166,666                
Number of shares per unit | shares 1 1                
Other related parties, anti-dilution provision, related party's right of ownership after any awards are issued                   20.00%
Proceeds from issue of shares     $ 12.5 £ 9,200            
Number of shares issued | shares     2,500,000 2,500,000            
Mudrick | Tranche A Warrant                    
Disclosure of transactions between related parties [line items]                    
Number of warrant per unit | shares 0.5 0.5                
Warrant term (in years) 5 years 5 years                
Exercise price per share | $ / shares $ 6                  
Mudrick | Tranche B Warrant                    
Disclosure of transactions between related parties [line items]                    
Number of warrant per unit | shares 0.5 0.5                
Warrant term (in years) 5 years 5 years                
Exercise price per share | $ / shares $ 7.5                  
Mudrick | Convertible loan notes                    
Disclosure of transactions between related parties [line items]                    
Fair value movements             318,035 230,495    
In-kind interest paid and accrued             12,205 0    
Stephen Fitzpatrick                    
Disclosure of transactions between related parties [line items]                    
Capital commitment option period         12 months 12 months        
Imagination Industries Investments Ltd                    
Disclosure of transactions between related parties [line items]                    
Services received, related party transaction             263 57    
Amount outstanding           £ 56 134 56    
Services provided to related parties             18 52    
Amounts receivable from related parties           £ 52 £ 18 £ 52    
Minimum | Stephen Fitzpatrick                    
Disclosure of transactions between related parties [line items]                    
Minimum ownership interest of related party to entitle party to participate in future equity offerings           3.00%   3.00%    
Maximum | Stephen Fitzpatrick                    
Disclosure of transactions between related parties [line items]                    
Investment option         $ 25.0 £ 20,000