Loss Per Ordinary Equity Share (Basic and Diluted) - Additional Information (Details) - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Ordinary Equity Share Basic And Diluted Earnings Loss Per Share [Abstract]
Net loss used in the calculation of loss per share	£ 40.5	£ 39.4	£ 32.5
Weighted average ordinary shares issued	96,584,512	88,950,441	81,772,124

The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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