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Capital and reserves, Allotted called up and fully paid (Details) - GBP (£)
£ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allotted, Called Up and Fully Paid [Abstract]      
Number of shares allotted, called up and fully paid £ 641 £ 490 £ 429
Ordinary Shares [Member]      
Allotted, Called Up and Fully Paid [Abstract]      
Number of shares allotted, called up and fully paid 268 252 247
Series A Shares [Member]      
Allotted, Called Up and Fully Paid [Abstract]      
Number of shares allotted, called up and fully paid 170 170 170
Series B Shares [Member]      
Allotted, Called Up and Fully Paid [Abstract]      
Number of shares allotted, called up and fully paid 115 62 0
Series C Shares [Member]      
Allotted, Called Up and Fully Paid [Abstract]      
Number of shares allotted, called up and fully paid 82 0 0
Growth Shares [Member]      
Allotted, Called Up and Fully Paid [Abstract]      
Number of shares allotted, called up and fully paid £ 6 £ 6 £ 12