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Financial liabilities at fair value through profit and loss - Additional Information (Details) - Convertible senior secured notes $ / shares in Units, £ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 15, 2021 USD ($) shares | Dec. 31, 2024 USD ($) $ / shares shares | Jun. 30, 2025 USD ($) shares | Jun. 30, 2025 GBP (£) shares | Dec. 23, 2024 USD ($) $ / shares shares
Financial liabilities at fair value through profit and loss |  |  |  |  |
Convertible shares | shares | 1,818,182 |  |  |  |
Ordinary shares | shares |  | 47,343,585 |  |  |
Market value per share | $ / shares |  | $ 7.42 |  |  |
Covenant for retention of cash under contract |  |  | $ 10,000,000 |  |
Cash at bank held to satisfy covenant under contract | £ |  |  |  | £ 7,298 |
Mudrick capital |  |  |  |  |
Financial liabilities at fair value through profit and loss |  |  |  |  |
Principal amount | $ 200,000,000 |  |  |  |
Aggregate purchase price | $ 192,000,000 |  |  |  |
Conversion rate | shares | 9.09091 |  |  |  |
Convertible senior secured notes principal amount, per instrument | $ 1,000 |  |  |  |
Interest paid in cash | Mudrick capital |  |  |  |  |
Financial liabilities at fair value through profit and loss |  |  |  |  |
Interest rate |  |  |  |  | 10.00%
Interest paid in-kind and semi-annually in arrears |  |  |  |  |
Financial liabilities at fair value through profit and loss |  |  |  |  |
Interest rate | 9.00% |  |  |  |
Interest paid in-kind and semi-annually in arrears | Mudrick capital |  |  |  |  |
Financial liabilities at fair value through profit and loss |  |  |  |  |
Interest rate |  |  |  |  | 12.00%
First half of principal amount |  |  |  |  |
Financial liabilities at fair value through profit and loss |  |  |  |  |
Conversion price (Per share price) | $ / shares |  | $ 2.75 |  |  |
Original Debt, Amount |  | $ 130,000,000 |  |  |
Mudrick capital | First half of principal amount |  |  |  |  |
Financial liabilities at fair value through profit and loss |  |  |  |  |
Conversion rate | shares |  |  |  |  | 363.636
Convertible senior secured notes principal amount, per instrument |  |  |  |  | $ 1,000
Conversion price (Per share price) | $ / shares |  |  |  |  | $ 2.75
Mudrick capital | Remaining half of principal amount |  |  |  |  |
Financial liabilities at fair value through profit and loss |  |  |  |  |
Conversion rate | shares |  |  |  |  | 285.714
Convertible senior secured notes principal amount, per instrument |  |  |  |  | $ 1,000
Conversion price (Per share price) | $ / shares |  |  |  |  | $ 3.5
Convertible instruments |  |  |  |  |
Financial liabilities at fair value through profit and loss |  |  |  |  |
Convertible shares | shares |  |  | 39,430,443 | 39,430,443 |

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