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Related party transactions - Key management compensation (Details)
6 Months Ended 12 Months Ended
Mar. 15, 2022
GBP (£)
Jun. 30, 2022
GBP (£)
director
Jun. 30, 2021
GBP (£)
director
Dec. 31, 2021
GBP (£)
Dec. 31, 2020
GBP (£)
Dec. 31, 2019
GBP (£)
Disclosure of transactions between related parties [line items]            
Salaries and other short term employee benefits   £ 629,000 £ 140,000 £ 244,000 £ 374,000 £ 181,000
Payments to defined contribution pension schemes   8,000 7,000 14,000 39,000 24,000
Share-based payments   79,000 76,000 156,000 92,000  
Key management compensation   716,000 223,000 414,000 505,000 £ 205,000
Amounts payable, related party transactions         6,309,000  
EMI share option scheme            
Disclosure of transactions between related parties [line items]            
Expense recognised from modifications of share-based payment arrangements £ 6,545,000 6,545,000        
Board of Director | EMI share option scheme            
Disclosure of transactions between related parties [line items]            
Expense recognised from modifications of share-based payment arrangements   4,434,000        
Imagination Industries Ltd            
Disclosure of transactions between related parties [line items]            
Amounts payable, related party transactions   0 2,945,000 £ 0 £ 6,000  
Services received, related party transactions   £ 0 £ 127,000      
Number of directors of entity to which related party has paid compensation on behalf of the entity | director   0 2