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Basis of Preparation (Details) - GBP (£)
£ in Thousands
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Basis of Preparation (Details) [Line Items]        
Net assets £ 306,300      
Cash balance 60,347 £ 243,524 £ 34,539 £ 26,366
Additional capital £ 836,000      
Sale of revenue, percentage 100.00%      
Customer Relationships [Member] | Bottom of Range [Member]        
Basis of Preparation (Details) [Line Items]        
Estimated useful lives 2 years      
Customer Relationships [Member] | Top of Range [Member]        
Basis of Preparation (Details) [Line Items]        
Estimated useful lives 6 years      
Brand Name [Member]        
Basis of Preparation (Details) [Line Items]        
Estimated useful lives 3 years