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Warrant Liability - Change in fair value (Details) - GBP (£)
£ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Warrant Liability    
Warrant liability at beginning of period £ 10,730  
Reclassification of MWC Options to equity (1,010)  
Change in fair value (4,373) £ (6,817)
Exchange differences on translation 840  
Warrant liability at end of period £ 6,187 £ 10,730