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Share-based Payments - Additional Information (Details) £ in Millions | 12 Months Ended
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Dec. 31, 2020 GBP (£) yr Plan | Dec. 31, 2019 GBP (£) | Dec. 31, 2018 GBP (£)
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Number of equity settled share-based payment plans | Plan | 6 |  |
Weighted average remaining contractual life of outstanding share options | 5 years 9 months 7 days | 3 years 11 months 15 days | 4 years 5 months 26 days
Employee remuneration expense, related to equity-settled share-based payments | £ | £ 4.3 | £ 3.2 | £ 1.8
U.K. Share-Based Payment Plans [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Share options granted, vesting period | 4 years | 4 years | 4 years
U.S Share Option Sub-Plan [Member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Share options granted, vesting period |  | 4 years |
Long-Term Incentive Plan [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Share options granted, vesting period | 4 years |  |
2018 Share Options [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Term of share options exercised |  |  | 2 years
2019 Share Options [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Term of share options exercised |  | 2 years |
2020 Share Options [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Term of share options exercised | 2 years |  |
Maximum [member] | Employees [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Expected option life (years) | 10 |  |
Maximum [member] | Directors [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Expected option life (years) | 10 |  |
Maximum [member] | Consultants [member] |  |  |
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items] |  |  |
Expected option life (years) | 10 |  |

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