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Significant accounting policies - Going concern (Details) - GBP (£) £ in Thousands | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021
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Significant accounting policies |  |  |  |
Cash and cash equivalents | £ 89,693 | £ 62,927 | £ 157,552 | £ 212,660
Expected funding requirements over next 12-month period | £ 80,000 |  |  |

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