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Income Tax Credit - Schedule of Major Components of Income Tax (Details) - GBP (£) £ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current tax: |  |  |
Total current tax | £ 2,291 | £ 2,116 | £ 1,176
Deferred tax: |  |  |
In respect of prior years, deferred tax | 1,007 | 333 | 430
Total deferred tax | 110 |  |
Income tax credit | 2,401 | 2,116 | 1,176
Current income tax receivable | 4,225 | 2,195 | 1,182
Deferred tax | 81 |  |
U.K. |  |  |
Current tax: |  |  |
In respect of current year | 2,298 | 1,906 | 1,182
In respect of prior years | 3 | 235 |
Deferred tax: |  |  |
Current income tax receivable | 4,207 | 2,141 | 1,182
U.S. |  |  |
Current tax: |  |  |
In respect of current year | (10) | (28) | (6)
In respect of prior years |  | 3 |
Deferred tax: |  |  |
In respect of current year, deferred tax | 61 |  |
In respect of prior years, deferred tax | 49 |  |
Current income tax receivable | 18 | £ 54 |
Deferred tax | £ 81 |  |
Current income tax payable |  |  | £ 6

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