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Other Reserves (Tables) | 12 Months Ended
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Dec. 31, 2020
Other Reserves |
Disclosure Of Other Reserves [Line Items] |
Schedule of Other Reserves |
|  | 2020 |  |  | 2019 |  |  | 2018 |
|  | (in thousands) |
|  | £ |  |  | £ |  |  | £ |
Own share reserve |  |  | (339 | ) |  |  | (339 | ) |  |  | (339 | )
Foreign currency translation reserve |  |  | (22 | ) |  |  | (10 | ) |  |  | 1 |
Capital reserve |  |  | 42,466 |  |  |  | 42,466 |  |  |  | 42,466 |
Share option reserve |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  | 20,620 |  |  |  | 17,564 |  |  |  | 15,955 |
Share-based payments |  |  | 4,823 |  |  |  | 3,289 |  |  |  | 1,977 |
Exercise of share options |  |  | (68 | ) |  |  | (132 | ) |  |  | (186 | )
Forfeiture of share options |  |  | (518 | ) |  |  | (63 | ) |  |  | (182 | )
Lapse of share options |  |  | (75 | ) |  |  | (38 | ) |  |  | — |
Balance at end of year |  |  | 24,782 |  |  |  | 20,620 |  |  |  | 17,564 |
Total other reserves |  |  | 66,887 |  |  |  | 62,737 |  |  |  | 59,692 |

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