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Earnings per share ("EPS") - Calculation of Basic and Diluted EPS (Details) - GBP (£) £ / shares in Units, £ in Millions, shares in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Earnings per share [abstract]
Profit for the year attributable to equity holders of the parent (£ million) - Basic	£ 542	£ 110	£ 683
Weighted average number of shares used in basic EPS calculation (million) (in shares)	1,077	1,072	1,098
Basic EPS (in dollar per share)	£ 0.503	£ 0.103	£ 0.622
Profit for the year attributable to equity holders of the parent (£ million) - Diluted	£ 542	£ 110	£ 683
Weighted average number of shares used in diluted EPS calculation (million) (in shares)	1,097	1,094	1,116
Diluted EPS (in dollar per share)	£ 0.494	£ 0.101	£ 0.612

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 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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