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Intangible assets (Details) - GBP (£)
£ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of changes in intangible assets and goodwill [abstract]    
Balance at the beginning £ 2,030  
Balance at the end 4,208 £ 2,030
Goodwill    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Balance at the beginning 1,473  
Balance at the end 1,473 1,473
IT software    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Balance at the beginning 557  
Balance at the end 2,735 557
Cost or valuation    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Balance at the beginning 2,388 2,155
Additions 2,565 233
Balance at the end 4,953 2,388
Cost or valuation | Goodwill    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Balance at the beginning 1,473 1,473
Balance at the end 1,473 1,473
Cost or valuation | IT software    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Balance at the beginning 915 682
Additions 2,565 233
Balance at the end 3,480 915
Amortisation    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Balance at the beginning (358) (95)
Amortisation charge 387 263
Balance at the end (745) (358)
Amortisation | IT software    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Balance at the beginning (358) (95)
Amortisation charge 387 263
Balance at the end £ (745) £ (358)