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Share capital and reserves- Allotted, called up and fully paid shares (Details)
Jun. 30, 2022
GBP (£)
£ / shares
shares
Dec. 31, 2021
GBP (£)
£ / shares
shares
Dec. 31, 2021
$ / shares
Dec. 31, 2020
GBP (£)
shares
Disclosure of classes of share capital [line items]        
Number of shares allotted, called up and fully paid shares 209,285,392 209,135,382   104,832
Share capital | £ £ 15,814 £ 15,804   £ 1.05
Number of other shares authorized for allotment 101,350,565      
A ordinary        
Disclosure of classes of share capital [line items]        
Par value per share | £ / shares   £ 0.00001    
Number of shares allotted, called up and fully paid shares       100,000
Share capital | £       £ 1.00
B ordinary        
Disclosure of classes of share capital [line items]        
Par value per share | £ / shares   £ 0.00001    
Number of shares allotted, called up and fully paid shares       4,832
Share capital | £       £ 0.05
Ordinary Share        
Disclosure of classes of share capital [line items]        
Par value per share | (per share) £ 0.0001   $ 0.0001  
Number of shares allotted, called up and fully paid shares 209,285,392 209,135,382    
Share capital | £ £ 15,814 £ 15,804