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Revenue, Deferred revenue (Details) - GBP (£)
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Deferred revenue [Abstract]          
Revenue recognized £ 1,602,000   £ 3,204,000    
Revenue recognised related to performance obligations 0 £ 0 0 £ 0  
Aggregate non-refundable fee payment £ 4,331,000   £ 4,331,000   £ 4,331,000