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

Year ended
31 Dec 2015
£m
Half year to
30 June 2016
£m
Half year to
30 June 2015
£m
Earnings
56.2Earnings for the purpose of basic earnings per share being net profit attributable to equity holders of the parent33.320.2
Number of shares
NumberNumberNumber
189,991,657Weighted average number of ordinary shares for the purposes of basic earnings per share190,141,575189,991,657
Effect of dilutive potential ordinary shares:
Share options
189,991,657Weighted average number of ordinary shares for the purposes of diluted earnings per share190,141,575189,991,657
Earnings per share
PencePencePence
29.6Basic17.510.6
29.6Diluted17.510.6
Headline earnings
£m£m£m
56.2Net profit attributable to equity holders of the parent33.320.2
Add back:
3.2Amortisation of acquired intangible fixed assets (net of tax)1.62.0
15.6Reorganisation costs (net of tax)17.9
75.0Headline earnings34.940.1
Headline earnings per share
PencePencePence
39.5Basic18.321.1
39.5Diluted18.321.1