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Significant accounting policies, Going concern (Details) - GBP (£)
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Going concern [Abstract]            
Cash and cash equivalents £ 342,341,000 £ 208,064,000 £ 342,341,000 £ 208,064,000 £ 332,539,000 £ 237,886,000
Net current assets 302,768,000   302,768,000      
Operating loss (15,773,000) (6,993,000) (33,160,000) (23,453,000)    
Net cash used in operating activities     6,401,000 (40,017,000)    
Net product revenue £ 45,514,000 £ 27,700,000 £ 87,566,000 £ 38,211,000