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Right of use assets (Details) - GBP (£)
£ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of quantitative information about right-of-use assets [line items]      
Balance at the beginning £ 1,062    
Charge for year 176 £ 140 £ 171
Balance at the end 1,969 1,062  
Property      
Disclosure of quantitative information about right-of-use assets [line items]      
Balance at the beginning 1,062    
Balance at the end 1,969 1,062  
Property | Cost or valuation      
Disclosure of quantitative information about right-of-use assets [line items]      
Balance at the beginning 1,445    
Additions 1,084    
Balance at the end 2,529 1,445  
Property | Depreciation      
Disclosure of quantitative information about right-of-use assets [line items]      
Balance at the beginning (383) (243)  
Charge for year (177) (140)  
Balance at the end £ (560) £ (383) £ (243)