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Share capital and reserves- Allotted, called up and fully paid shares (Details) - GBP (£)
Jun. 30, 2022
Dec. 31, 2021
Disclosure of classes of share capital [line items]    
Number of shares allotted, called up and fully paid shares 209,285,392 209,135,382
Share capital £ 15,814 £ 15,804
Number of other shares authorized for allotment 101,350,565  
Ordinary Share    
Disclosure of classes of share capital [line items]    
Par value per share £ 0.0001  
Number of shares allotted, called up and fully paid shares 209,285,392 209,135,382
Share capital £ 15,814 £ 15,804