The calculation of the basic and diluted earnings per share is based on the following data:

	2012 £m	2011 £m
Earnings
Earnings for the purpose of basic earnings per share being net profit attributable to equity holders of the parent	66.9	55.8

	2012 Number	2011 Number
Number of shares
Weighted average number of ordinary shares for the purpose of basic earnings per share	186,981,962	185,838,882
Effect of dilutive potential ordinary shares:
Share options	19,307	3,780,964
Weighted average number of ordinary shares for the purpose of diluted earnings per share	187,001,269	189,619,846

	2012 Pence	2011 Pence
Earnings per share:
Basic	35.8	30.0
Diluted	35.8	29.4

Headline earnings

	2012 £m	2011 £m
Net profit attributable to equity holders of the parent	66.9	55.8
Add back:
Amortisation of acquired intangible fixed assets (net of tax)	1.9	0.8
Impairment charge	–	4.2
Profit on disposal of investment (net of tax)	(2.2)	–
Acquisition costs (net of tax)	1.6	–
Reorganisation costs (net of tax)	1.8	–
Headline earnings	70.0	60.8

Earnings per share from headline earnings:

	2012 Pence	2011 Pence
Basic	37.4	32.7
Diluted	37.4	32.1