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Financial Instruments Risk Management - Summary of Financial Assets and Liabilities in Foreign Currencies, Primarily Held in U.S Dollars (Details) - GBP (£) £ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Financial assets |  |  |  |
Current income tax receivable | £ 9,822 | £ 8,481 | £ 4,263 |
Cash and cash equivalents | 87,356 | 51,962 | 76,972 | £ 86,703
Financial liabilities |  |  |  |
Payroll taxes and social security | 177 | 160 |  |
Lease liabilities | 645 | 806 | £ 434 |
Accrued expenditure | 5,437 | 3,342 |  |
Currency Risk [member] |  |  |  |
Financial assets |  |  |  |
Prepayments, accrued income and other receivables | 2,079 | 2,174 |  |
Current income tax receivable | 4 | 4 |  |
Cash and cash equivalents | 70,419 | 28,980 |  |
Financial liabilities |  |  |  |
Trade payables | 409 | 549 |  |
Payroll taxes and social security | 1 | 18 |  |
Lease liabilities | 105 | 52 |  |
Accrued expenditure | £ 926 | £ 989 |  |

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