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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
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