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Loss per share - Basic and diluted loss per share (Details) - GBP (£) £ / shares in Units, £ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Loss per share
Net loss for the period	£ (17,021)	£ (22,557)	£ (245,224)	£ (12,326)	£ (7,484)
Basic loss per share	£ (0.10)	£ (0.20)	£ (1.98)	£ (0.12)	£ (0.07)
Diluted loss per share	£ (0.10)	£ (0.20)	£ (1.98)	£ (0.12)	£ (0.07)
Weighted average issued shares	178,329,218	115,155,683	124,130,921	99,904,427	99,904,427
Adjusted weighted average issued shares	178,329,218	115,155,683	124,130,921	99,904,427	99,904,427

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- Definition

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The profit (loss) attributable to ordinary equity holders of the parent entity. [Refer: Profit (loss)]

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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.

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