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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Property Plant And Equipment [Abstract] |
Property, plant and equipment | 9. Property, plant and equipment
|  | Right of use assets |  |  | Office and computer equipment |  |  | Fixtures and Fittings |  |  | Total |
|  | (in thousands) |
|  | £ |  |  | £ |  |  | £ |  |  | £ |
Cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At December 31, 2018 |  |  | — |  |  |  | 210 |  |  |  | 406 |  |  |  | 616 |
Recognized on adoption of IFRS 16 Leases |  |  | 455 |  |  |  | — |  |  |  | — |  |  |  | 455 |
Additions |  |  | 530 |  |  |  | 27 |  |  |  | 12 |  |  |  | 569 |
Re-measurement |  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | 2 |
Disposals |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | (1 | )
Effect of foreign currency exchange differences |  |  | (5 | ) |  |  | — |  |  |  | — |  |  |  | (5 | )
At December 31, 2019 |  |  | 982 |  |  |  | 236 |  |  |  | 418 |  |  |  | 1,636 |
Depreciation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At December 31, 2018 |  |  | — |  |  |  | 96 |  |  |  | 93 |  |  |  | 189 |
Charge for the year |  |  | 193 |  |  |  | 65 |  |  |  | 83 |  |  |  | 341 |
Disposals |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | (1 | )
Effect of foreign currency exchange differences |  |  | (2 | ) |  |  | — |  |  |  | — |  |  |  | (2 | )
At December 31, 2019 |  |  | 191 |  |  |  | 160 |  |  |  | 176 |  |  |  | 527 |
Cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At December 31, 2019 |  |  | 982 |  |  |  | 236 |  |  |  | 418 |  |  |  | 1,636 |
Additions |  |  | — |  |  |  | 90 |  |  |  | 291 |  |  |  | 381 |
Re-measurement |  |  | 115 |  |  |  | — |  |  |  | — |  |  |  | 115 |
Effect of foreign currency exchange differences |  |  | (10 | ) |  |  | — |  |  |  | — |  |  |  | (10 | )
At December 31, 2020 |  |  | 1,087 |  |  |  | 326 |  |  |  | 709 |  |  |  | 2,122 |
Depreciation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At December 31, 2019 |  |  | 191 |  |  |  | 160 |  |  |  | 176 |  |  |  | 527 |
Charge for the year |  |  | 268 |  |  |  | 61 |  |  |  | 83 |  |  |  | 412 |
Effect of foreign currency exchange differences |  |  | (6 | ) |  |  | — |  |  |  | — |  |  |  | (6 | )
At December 31, 2020 |  |  | 453 |  |  |  | 221 |  |  |  | 259 |  |  |  | 933 |
Net book value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At December 31, 2020 |  |  | 634 |  |  |  | 105 |  |  |  | 450 |  |  |  | 1,189 |
At December 31, 2019 |  |  | 791 |  |  |  | 76 |  |  |  | 242 |  |  |  | 1,109 |

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- Definition The entire disclosure for property, plant and equipment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&doctype=Standard&dita_xref=IAS16_g73-79_TI -URIDate 2020-01-01 + Details
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