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Property, plant and equipment - Balance (Details) - GBP (£)
£ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of changes in property, plant and equipment [abstract]    
Balance at the beginning £ 1,422  
Balance at the end 1,834 £ 1,422
Leasehold improvements    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance at the beginning 1,162  
Balance at the end 1,156 1,162
Office equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance at the beginning 260  
Balance at the end 678 260
Cost or valuation    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance at the beginning 1,809 1,654
Additions 790 155
Balance at the end 2,599 1,809
Cost or valuation | Leasehold improvements    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance at the beginning 1,368 1,350
Additions 162 18
Balance at the end 1,530 1,368
Cost or valuation | Office equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance at the beginning 441 304
Additions 628 137
Balance at the end 1,069 441
Depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance at the beginning (387) (108)
Charge for year 378 279
Balance at the end (765) (387)
Depreciation | Leasehold improvements    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance at the beginning (206) (32)
Charge for year 168 174
Balance at the end (374) (206)
Depreciation | Office equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance at the beginning (181) (76)
Charge for year 210 105
Balance at the end £ (391) £ (181)