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Prepayments, Accrued Income and Other Receivables - Summary of Prepayments, Accrued Income and Other Receivables Explanatory (Detail) - GBP (£) £ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Prepayments Accrued Income And Other Receivables [Abstract] |  |
Prepayments - manufacturing and clinical | £ 2,177 | £ 2,630
Prepayments - other | 1,625 | 1,489
Accrued income | 4 | 76
VAT | 813 | 475
Other receivables | 9 | 40
Prepayments, accrued income and other receivables | £ 4,628 | £ 4,710

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