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Earnings per share - Details of the adjusted earnings per share (Details) - GBP (£) £ / shares in Units, £ in Millions, shares in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings per share
Profit attributable to equity holders of the Company	£ 232	£ 263	£ 186
Weighted average number of ordinary shares in issue (million)	2,002	1,858	1,853
Adjustment for potentially dilutive shares (million)	12	8	10
Weighted average number of ordinary shares for diluted earnings per share (million)	2,014	1,866	1,863
Basic earnings per share	£ 0.1157	£ 0.1416	£ 0.1003
Diluted earnings per share	£ 0.1151	£ 0.1410	£ 0.0998

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]]

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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 potential dilutive effect on the weighted average number of ordinary shares that relates to the assumed conversion of the entity’s contingently issuable shares.

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The profit (loss) from continuing and discontinued operations attributable to owners of the parent. [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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