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Financial Instruments Risk Management - Additional Information (Details) - GBP (£) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Financial Instruments [Line Items] |  |  |  |
Cash and cash equivalents | £ 87,356,000 | £ 51,962,000 | £ 76,972,000 | £ 86,703,000
Interest Rate Risk [member] |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |
Cash and cash equivalents | £ 87,400,000 | 52,000,000 |  |
Increase in interest rates | 0.50% |  |  |
Increase in interest income on cash and cash equivalents held on variable and short term fixed rate deposits | £ 269,511 | 244,674 |  |
Currency Risk [member] |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |
Cash and cash equivalents | £ 70,419,000 | 28,980,000 |  |
Percentage of increase in foreign exchange rate | 1.00% |  |  |
Reduction in financial assets and liabilities in foreign currencies | £ (710,592) | £ (295,498) |  |

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_i&doctype=Standard -URIDate 2020-01-01 + Details
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