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Leases - Reconciliation of the finance lease creditors (Details) - GBP (£)
£ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance £ 1,021 £ 1,166
Additions 1,084  
Interest element of payments to finance lease creditors (78) (74)
Principal element of payments to finance lease creditors (162) (146)
Interest expense on leases 77 74
Ending balance £ 1,942 £ 1,021
Bristol property    
Disclosure of quantitative information about right-of-use assets [line items]    
Lease agreement term 5 years