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Loans from related parties - Loan from Imagination Industries Ltd (Details) - GBP (£)
£ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of transactions between related parties [line items]    
As at January 1 £ 6,309  
Amounts advanced 2,945 £ 5,600
Interest charged 483 709
Amounts repaid (737)  
Conversion to equity £ (9,000)  
As at December 31   £ 6,309
Companies owned by key management personnel | Imagination Industries Ltd    
Disclosure of transactions between related parties [line items]    
Interest rate 30.00% 30.00%
Microsoft and Rocket    
Disclosure of transactions between related parties [line items]    
Amounts advanced £ 25,000  
Conversion to equity £ (25,000)