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

Year ended
31 Dec 2014
£m
Half year to
30 June 2015
£m
Half year to
30 June 2014
£m
Earnings
79.4Earnings for the purpose of basic earnings per share being net profit attributable to equity holders of the parent20.240.2
Number of shares
NumberNumberNumber
190,243,625Weighted average number of ordinary shares for the purposes of basic earnings per share189,991,657190,235,073
Effect of dilutive potential ordinary shares:
Share options
190,243,625Weighted average number of ordinary shares for the purposes of diluted earnings per share189,991,657190,235,073
Earnings per share
PencePencePence
41.7Basic10.621.1
41.7Diluted10.621.1
Headline earnings
£m£m£m
79.4Net profit attributable to equity holders of the parent20.240.2
Add back:
3.8Amortisation of acquired intangible fixed assets (net of tax)2.01.8
0.2Acquisition costs (net of tax)
Reorganisation costs (net of tax)17.9
83.4Headline earnings40.142.0
Headline earnings per share
PencePencePence
43.8Basic21.122.1
43.8Diluted21.122.1