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Ordinary shares (Details) | 12 Months Ended
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Dec. 31, 2024 Vote $ / shares £ / shares shares | Dec. 31, 2023 $ / shares £ / shares shares
Ordinary shares |  |
Vote per ordinary share | Vote | 1 |
Dividends declared | $ / shares | $ 0 | $ 0
Ordinary shares, shares authorized | shares | 155,876,645 | 59,612,613
Ordinary shares, nominal value | £ / shares | $ 0.01 | $ 0.01

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