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Leases - Lease liabilities maturity analysis (Details) - GBP (£)
£ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of maturity analysis of operating lease payments [line items]    
Total lease liabilities (undiscounted) £ 2,340 £ 1,272
Less than one year    
Disclosure of maturity analysis of operating lease payments [line items]    
Total lease liabilities (undiscounted) 425 175
Within 2 - 5 years    
Disclosure of maturity analysis of operating lease payments [line items]    
Total lease liabilities (undiscounted) 1,653 700
More than 5 years    
Disclosure of maturity analysis of operating lease payments [line items]    
Total lease liabilities (undiscounted) £ 262 £ 397