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Staff Costs | 12 Months Ended
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Dec. 31, 2020
Classes Of Employee Benefits Expense [Abstract] |
Staff costs | 3. Staff costs Included in research and development expenses:
|  | 2020 |  |  | 2019 |  |  | 2018 |
|  | (in thousands) |
|  | £ |  |  | £ |  |  | £ |
Wages and salaries |  |  | 3,492 |  |  |  | 3,304 |  |  |  | 2,761 |
Social security costs |  |  | 430 |  |  |  | 395 |  |  |  | 314 |
Pension costs |  |  | 189 |  |  |  | 140 |  |  |  | 139 |
Share-based payments |  |  | 2,412 |  |  |  | 1,878 |  |  |  | 835 |
|  |  | 6,523 |  |  |  | 5,717 |  |  |  | 4,049 |
Included in administrative expenses:
|  | 2020 |  |  | 2019 |  |  | 2018 |
|  | (in thousands) |
|  | £ |  |  | £ |  |  | £ |
Wages and salaries |  |  | 1,387 |  |  |  | 1,190 |  |  |  | 790 |
Social security costs |  |  | 135 |  |  |  | 115 |  |  |  | 75 |
Pension costs |  |  | 47 |  |  |  | 37 |  |  |  | 37 |
Share-based payments |  |  | 1,893 |  |  |  | 1,348 |  |  |  | 960 |
|  |  | 3,462 |  |  |  | 2,690 |  |  |  | 1,862 |
Total employee benefit expense |  |  | 9,985 |  |  |  | 8,407 |  |  |  | 5,911 |
The average number of staff employed under contracts of service were:
|  | 2020 |  |  | 2019 |  |  | 2018 |
|  | (number) |
Research and development activities |  |  | 24 |  |  |  | 23 |  |  |  | 18 |
Administrative activities |  |  | 6 |  |  |  | 5 |  |  |  | 4 |
|  |  | 30 |  |  |  | 28 |  |  |  | 22 |
Directors’ remuneration & other benefits
|  | 2020 |  |  | 2019 |  |  | 2018 |
|  | (in thousands) |
|  | £ |  |  | £ |  |  | £ |
Directors’ remuneration |  |  | 1,167 |  |  |  | 1,222 |  |  |  | 1,143 |
Pension and other benefits |  |  | 61 |  |  |  | 52 |  |  |  | 51 |
|  |  | 1,228 |  |  |  | 1,274 |  |  |  | 1,194 |
The number of directors who exercised share options in 2020 was nil (2019: 1; 2018: 1). The gain on exercise of these options was nil (2019: £1.4 million; 2018: £4.2 million). 3. Staff costs (continued) The above amounts for remuneration include the following in respect of the highest paid director:
|  | 2020 |  |  | 2019 |  |  | 2018 |
|  | (in thousands) |
|  | £ |  |  | £ |  |  | £ |
Directors’ remuneration |  |  | 861 |  |  |  | 780 |  |  |  | 739 |
Pension and other benefits |  |  | 59 |  |  |  | 48 |  |  |  | 47 |
|  |  | 920 |  |  |  | 828 |  |  |  | 786 |

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- References No definition available. + Details
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- Definition The entire disclosure for employee benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Section Scope -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&doctype=Standard&dita_xref=IAS19_g2-7_TI -URIDate 2020-01-01 + Details
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