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Income Tax Credit - Schedule of Major Components of Income Tax (Details) - GBP (£) £ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Current tax: |  |  |
Total current tax | £ 5,494 | £ 4,238 | £ 4,261
Deferred tax: |  |  |
In respect of prior years, deferred tax | (2,901) | (1,962) | (2,043)
Total deferred tax | (1) | 1 | (38)
Income tax credit | 5,493 | 4,239 | 4,223
Current income tax receivable | 9,822 | 8,481 | 4,263
Deferred tax | 44 | 46 |
U.K. [member] |  |  |
Current tax: |  |  |
In respect of current year | 5,516 | 4,325 | 4,239
In respect of prior years | (22) | (86) | 19
Deferred tax: |  |  |
Current income tax receivable | 9,818 | 8,477 | 4,239
U.S. [member] |  |  |
Current tax: |  |  |
In respect of current year |  | (1) |
In respect of prior years |  |  | 3
Deferred tax: |  |  |
In respect of current year, deferred tax |  | 1 | 11
In respect of prior years, deferred tax | (1) |  | (49)
Current income tax receivable | 4 | 4 | 24
Deferred tax | £ 44 | £ 46 | £ 47

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