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Taxation (Details) - GBP (£)
£ in Millions
12 Months Ended
Mar. 11, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Taxation (Details) [Line Items]        
Deferred tax liabilities  
Unutilized tax losses   £ 127.2 £ 18.5 £ 0.1
Finance Bill 2020 [Member] | Tax Years 2020 [Member]        
Taxation (Details) [Line Items]        
Tax rate effect from change in tax rate 19.00%      
Finance Bill 2020 [Member] | Tax Years 2021 [Member]        
Taxation (Details) [Line Items]        
Tax rate effect from change in tax rate 19.00%