(Loss))/earnings per share (Details) - GBP (£) £ / shares in Units, £ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Net profit/(loss):
Net (loss)/earnings for the period for basic earnings per share	£ (42,125)	£ (144,763)	£ 18,685	£ 250,962
Adjustment for calculation of diluted earnings per share:
Fair value movements on financial liabilities at fair value through profit and loss				(258,719)
In-kind interest on financial liabilities at fair value through profit and loss				5,782
Net (loss)/earnings for the period for diluted earnings per share	£ (42,125)	£ (144,763)	£ 18,685	£ (1,975)
Weighted average ordinary shares:
Weighted average issued shares for basic earnings per share	132,999,112	82,319,241	116,941,228	80,090,993
Financial liabilities at fair value through profit and loss			4,116,662	37,376,218
Employee share options			672,691
Weighted average issued shares for diluted earnings per share	132,999,112	82,319,241	121,730,851	117,467,211
Basic (loss)/earnings per share	£ (0.32)	£ (1.76)	£ 0.16	£ 3.13
Diluted (loss)/earnings per share	£ (0.32)	£ (1.76)	£ 0.15	£ (0.02)

Adjustment for dilutive effect of fair value movements on financial liabilities at fair value through profit or loss.

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Adjustment for dilutive effect of interest on financial liabilities at fair value through profit or loss.

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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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- Definition

The potential dilutive effect on the weighted average number of ordinary shares that relate to the assumed conversion of the entity's convertible instruments.

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The potential dilutive effect on the weighted average number of ordinary shares that relate to the assumed exercise of the entity's share options.

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

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The profit (loss) attributable to ordinary equity holders of the parent entity, adjusted for the effects of all dilutive potential ordinary shares. [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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