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Related party transactions - Transactions with Mudrick capital and Stephen Fitzpatrick (Details) $ / shares in Units, £ in Thousands, $ in Millions |  |  | 1 Months Ended | 6 Months Ended |
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Jul. 10, 2025 USD ($) shares | Jan. 24, 2025 USD ($) $ / shares shares | Jul. 31, 2025 USD ($) shares | Jun. 30, 2025 GBP (£) shares | Jun. 30, 2024 GBP (£) | Jun. 30, 2025 USD ($) $ / shares | Jun. 30, 2025 GBP (£)
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Proceeds from issue of shares | £ |  |  |  | £ 44,214 |  |  |
Underwritten public offering |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Gross Proceeds | $ |  | $ 90.0 |  |  |  |  |
Number of shares issued |  | 15,000,000 |  |  |  |  |
Proceeds from issue of shares | £ |  |  |  | 44,203 |  |  |
Share transaction | Underwritten public offering |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Gross Proceeds | $ | $ 69.0 |  |  |  |  |  |
Number of shares issued | 13,800,000 |  |  |  |  |  |
Proceeds from issue of shares | $ | $ 69.0 |  |  |  |  |  |
Tranche A Warrant |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Exercise price per share | $ / shares |  | $ 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 |  |  |  |  |
Issuance of units |  | 4,166,666 |  |  |  |  |
Number of shares per unit |  | 1 |  |  |  |  |
Mudrick | Share transaction |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Number of shares issued |  |  | 2,500,000 |  |  |  |
Proceeds from issue of shares | $ |  |  | $ 12.5 |  |  |  |
Mudrick | Tranche A Warrant |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Number of warrant per unit |  | 0.5 |  |  |  |  |
Warrant term (in years) |  | 5 years |  |  |  |  |
Exercise price per share | $ / shares |  | $ 6 |  |  |  |  |
Mudrick | Tranche B Warrant |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Warrant term (in 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 | £ |  |  |  | 258,719 |  |  |
In-kind interest paid and accrued | £ |  |  |  | 5,782 |  |  |
Imagination Industries Investments Ltd |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Services received, related party transaction | £ |  |  |  | £ 151 | £ 21 |  |
Amount outstanding | £ |  |  |  |  | £ 21 |  | £ 37
Stephen Fitzpatrick |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Capital commitment option period |  |  |  |  |  | 12 months | 12 months
Number of shares per unit which related party has option to invest in |  |  |  | 1 |  |  |
Stephen Fitzpatrick | Underwritten public offering |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Exercise price per unit in related party's investment option | $ / shares |  |  |  |  |  | $ 6 |
Stephen Fitzpatrick | Tranche A Warrant |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Number of warrants per unit which related party has option to invest in |  |  |  | 0.5 |  |  |
Stephen Fitzpatrick | Tranche B Warrant |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Number of warrants per unit which related party has option to invest in |  |  |  | 0.5 |  |  |
Maximum | Stephen Fitzpatrick |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Investment in entity that related party has option to make | $ |  |  |  |  |  | $ 25.0 |

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