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Basic and diluted loss per share (Details) - GBP (£) £ / shares in Units, £ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Basic and diluted profit/ (loss) [Abstract]
Loss for the period	£ (14,077)	£ (6,121)	£ (30,774)	£ (22,249)
Basic weighted average number of shares (in shares)	48,694,047	43,935,837	48,440,318	43,901,011
Diluted weighted average number of shares (in shares)	48,694,047	43,935,837	48,440,318	43,901,011
Basic loss per share (in pounds per share)	£ (0.29)	£ (0.14)	£ (0.64)	£ (0.51)
Diluted loss per share (in pounds per share)	£ (0.29)	£ (0.14)	£ (0.64)	£ (0.51)

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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 total of income less expenses from continuing and discontinued operations, excluding the components of other comprehensive income. [Refer: Other comprehensive income]

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