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Derivative financial liabilities - Additional Information (Details) - 12 months ended Dec. 31, 2021 £ in Thousands, $ in Thousands | GBP (£) shares | USD ($) shares | USD ($) shares
--- | --- | --- | ---
Disclosure of financial liabilities [line items] |  |  |
Aggregate purchase price | £ 166,981 |  |
Limitation on restricted payments for retention guarantors | $ |  | $ 10,000 |
Restricted cash | £ 7,420 |  |
Convertible Senior Secured Notes |  |  |
Disclosure of financial liabilities [line items] |  |  |
Convertible shares | shares | 18,181,820 | 18,181,820 |
Conversion ratio per $1000 principal amount | shares | 90.9091 |  | 90.9091
Additional interest rate | 2.00% |  | 2.00%
Convertible Senior Secured Notes | Interest paid in cash |  |  |
Disclosure of financial liabilities [line items] |  |  |
Interest rate | 7.00% |  | 7.00%
Convertible Senior Secured Notes | Interest paid in-kind and semi-annually in arrears |  |  |
Disclosure of financial liabilities [line items] |  |  |
Interest rate | 9.00% |  | 9.00%
Mudrick | Convertible Senior Secured Notes |  |  |
Disclosure of financial liabilities [line items] |  |  |
Principal amount | £ 151,000 |  | $ 200,000
Aggregate purchase price | 145,000 | $ 192,000 |
Convertible Senior Secured Notes Principal Amount | 756 |  | $ 1,000
Microsoft and Rocket |  |  |
Disclosure of financial liabilities [line items] |  |  |
Aggregate purchase price | £ 25,000 |  |

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