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Earnings per share ("EPS") - Calculation of Basic and Diluted EPS (Details) - GBP (£) £ / shares in Units, £ in Millions, shares in Millions	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Earnings per share [abstract]
Earnings	£ 44	£ 205
Weighted average shares used in basic EPS calculation (shares)	1,077	1,075
EPS (pounds per share)	£ 0.041	£ 0.191
Diluted earnings	£ 44	£ 205
Weighted average shares used in diluted EPS calculation (shares)	1,093	1,092
Diluted EPS (pounds per share)	£ 0.040	£ 0.188

X

- 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]]

+ References

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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 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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