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Non-current interest-bearing loans and borrowings, Loan and security agreement (Details)
£ in Thousands, $ in Millions
Dec. 31, 2020
GBP (£)
Nov. 06, 2020
USD ($)
Tranche
Dec. 31, 2019
GBP (£)
Interest-bearing loans and borrowings [Abstract]      
Borrowings outstanding | £ £ 36,654   £ 0
Oxford Finance Agreement [Member]      
Interest-bearing loans and borrowings [Abstract]      
Borrowings, maximum capacity   $ 100  
Number of tranches | Tranche   3  
Oxford Finance Agreement, Tranche One [Member]      
Interest-bearing loans and borrowings [Abstract]      
Borrowings outstanding   $ 50  
Oxford Finance Agreement, Tranche Two [Member]      
Interest-bearing loans and borrowings [Abstract]      
Borrowings outstanding   25  
Oxford Finance Agreement, Tranche Three [Member]      
Interest-bearing loans and borrowings [Abstract]      
Borrowings, remaining amount   $ 25