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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - GBP (£)
£ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Property Plant And Equipment [Line Items]    
Beginning Balance £ 1,109  
Ending Balance 1,189 £ 1,109
Cost [member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Beginning Balance 1,636 616
Recognized on adoption of IFRS 16 Leases   455
Additions 381 569
Re-measurement 115 2
Disposals   1
Effect of foreign currency exchange differences (10) (5)
Ending Balance 2,122 1,636
Depreciation [member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Beginning Balance (527) (189)
Charge for the year 412 341
Disposals   (1)
Effect of foreign currency exchange differences (6) (2)
Ending Balance (933) (527)
Right of Use Assets [member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Beginning Balance 791  
Ending Balance 634 791
Right of Use Assets [member] | Cost [member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Beginning Balance 982  
Recognized on adoption of IFRS 16 Leases   455
Additions   530
Re-measurement 115 2
Effect of foreign currency exchange differences (10) (5)
Ending Balance 1,087 982
Right of Use Assets [member] | Depreciation [member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Beginning Balance (191)  
Charge for the year 268 193
Effect of foreign currency exchange differences (6) (2)
Ending Balance (453) (191)
Office and Computer Equipment [member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Beginning Balance 76  
Ending Balance 105 76
Office and Computer Equipment [member] | Cost [member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Beginning Balance 236 210
Additions 90 27
Disposals   1
Ending Balance 326 236
Office and Computer Equipment [member] | Depreciation [member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Beginning Balance (160) (96)
Charge for the year 61 65
Disposals   (1)
Ending Balance (221) (160)
Fixtures and Fittings [member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Beginning Balance 242  
Ending Balance 450 242
Fixtures and Fittings [member] | Cost [member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Beginning Balance 418 406
Additions 291 12
Ending Balance 709 418
Fixtures and Fittings [member] | Depreciation [member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Beginning Balance (176) (93)
Charge for the year 83 83
Ending Balance £ (259) £ (176)