Basic earnings per share are calculated by dividing the profit attributable to ordinary shareholders by the weighted average number of ordinary shares in issue during the period. The weighted average number of shares excludes shares held by an Employee Benefit Trust (see Note 22) and has been adjusted for the issue/purchase of shares during the period.

For diluted earnings per share, the weighted average number of ordinary shares in issue is adjusted to assume conversion of all dilutive potential ordinary shares. These represent share options granted to employees where the exercise price is less than the average market price of the Company's ordinary shares during the 52 weeks to 29 March 2019.

The Group has also chosen to present an alternative earnings per share measure, underlying earnings per share, with profit adjusted for non-underlying items because it better reflects the Group's underlying performance. This measure is defined in the Glossary of Alternative Performance Measures.

For the period52 weeks to
29 March
2019
Number of shares
m
52 weeks to
30 March
2018
Number of shares
m
Weighted average number of shares in issue199.1199.1
Less: shares held by the Employee Benefit Trust (weighted average)(2.0)(2.1)
Weighted average number of shares for calculating basic earnings per share197.1197.0
Weighted average number of dilutive shares2.11.6
Total number of shares for calculating diluted earnings per share199.2198.6
For the period52 weeks to
29 March
2019
£m
52 weeks to
30 March
2018
£m
Basic earnings attributable to equity shareholders41.954.7
Non-underlying items (see Note 5):
Operating expenses7.84.8
Finance costs(0.3)
Tax on non-underlying items(1.4)(0.8)
Underlying earnings before non-underlying items48.358.4

Earnings per share is calculated as follows:

For the period52 weeks to
29 March
2019
52 weeks to
30 March
2018
Basic earnings per ordinary share21.2p27.8p
Diluted earnings per ordinary share21.0p27.5p
 
Basic underlying earnings per ordinary share24.5p29.6p
Diluted underlying earnings per ordinary share24.2p29.4p