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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
One-off and adjusting items	136	21	8
Amortisation and impairment of intangibles	118	74	82
Net interest adjustments	(18)	(4)	35
Tax on above items	(41)	(18)	(26)
Adjusted profit attributable to equity holders of the Company	£ 427	£ 336	£ 285
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
Basic adjusted earnings per share	0.2134	0.1807	0.1537
Diluted adjusted earnings per share	£ 0.2122	£ 0.1799	£ 0.1529
Net interest credit from pensions	£ 0	£ 0	£ 1
Finance costs from hedge accounting recognised in other comprehensive income	0	4	5
IFRS 16 interest adjustment	0	0	(2)
Interest fair value adjustment	21	0	(38)
Discount unwind	(3)	0	0
One-off and adjusting items tax impact	20	2	2
Tax on amortisation and impairment of intangibles	25	18	18
Tax on net interest adjustments	£ (3)	£ (1)	£ 6

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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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