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Financial instruments, Financial assets and liabilities in foreign currency risk (Details) - GBP (£)	Dec. 31, 2020	Dec. 31, 2019
Financial assets at amortized cost [Abstract]
Financial assets	£ 136,307,000	£ 80,545,000
Financial liabilities at amortized cost [Abstract]
Financial liabilities	61,738,000	39,863,000
Interest Receivable [Member]
Financial assets at amortized cost [Abstract]
Financial assets	0	28,000
Cash and Cash Equivalents [Member]
Financial assets at amortized cost [Abstract]
Financial assets	129,716,000	73,966,000
Trade Payables [Member]
Financial liabilities at amortized cost [Abstract]
Financial liabilities	25,084,000	15,579,000
Interest Bearing Loans and Borrowings [Member]
Financial liabilities at amortized cost [Abstract]
Financial liabilities	36,654,000	19,157,000
Foreign Currency Risk [Member]
Financial assets at amortized cost [Abstract]
Financial assets	96,880,000	14,391,000
Financial liabilities at amortized cost [Abstract]
Financial liabilities	50,433,000	23,531,000
Foreign Currency Risk [Member] | Interest Receivable [Member]
Financial assets at amortized cost [Abstract]
Financial assets	0	15,000
Foreign Currency Risk [Member] | Clinical Trial Deposits and Other Debtors [Member]
Financial assets at amortized cost [Abstract]
Financial assets	4,036,000	1,858,000
Foreign Currency Risk [Member] | Cash and Cash Equivalents [Member]
Financial assets at amortized cost [Abstract]
Financial assets	92,844,000	12,518,000
Foreign Currency Risk [Member] | Trade Payables [Member]
Financial liabilities at amortized cost [Abstract]
Financial liabilities	13,779,000	4,374,000
Foreign Currency Risk [Member] | Interest Bearing Loans and Borrowings [Member]
Financial liabilities at amortized cost [Abstract]
Financial liabilities	36,654,000	19,157,000
5% Point Increase [Member]
Foreign currency risk [Abstract]
Net financial assets and liabilities, carrying value	(2,869,000)	655,000
5% Point Decrease [Member]
Foreign currency risk [Abstract]
Net financial assets and liabilities, carrying value	£ 28,589,000	£ (655,000)

X

- Definition

The amount of financial assets at amortised cost. The amortised cost is the amount at which financial assets are measured at initial recognition minus principal repayments, plus or minus the cumulative amortisation using the effective interest method of any difference between that initial amount and the maturity amount, and adjusted for any impairment. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 8
-Subparagraph f
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_8_f&doctype=Standard
-URIDate 2020-01-01

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- Definition

The amount of financial liabilities at amortised cost. The amortised cost is the amount at which financial liabilities are measured at initial recognition minus principal repayments, plus or minus the cumulative amortisation using the effective interest method of any difference between that initial amount and the maturity amount. [Refer: Financial liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 8
-Subparagraph g
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_8_g&doctype=Standard
-URIDate 2020-01-01

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 8
-Subparagraph f
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The amount of net financial assets and liabilities.

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