Weighted average number of ordinary shares for the purposes of basic earnings per share
Effect of dilutive potential ordinary shares: Share options
Weighted average number of ordinary shares for the purpose of diluted earnings per share
The denominator for the purposes of calculating both basic and diluted earnings per share has been adjusted to reflect shares issued and acquired from the market during the year (note 20).
The earnings used in both the adjusted basic and adjusted diluted earnings per share are adjusted to take into account the net interest on defined benefit obligations (note 32) and the effect of non-trading items after tax.
The calculation of the basic and diluted earnings per share attributable to the ordinary equity holders of the parent is based on the following data:
Earnings for the purposes of basic and diluted earnings per share -
(Loss) / profit for the financial year attributable to equity holders of the parent
Non-trading item after tax (note 10)
Net interest cost on defined benefit obligations (note 32 vii)
Earnings for the purposes of adjusted basic and diluted earnings per share
Basic earnings per share
Diluted earnings per share
Adjusted basic earnings per share
Adjusted diluted earnings per share
Diluted earnings per ordinary share
Diluted earnings per ordinary share is calculated by adjusting the weighted average number of ordinary shares outstanding for the dilutive effect of share options. All 5,756,140 options outstanding at the end of the reporting period (2019: 3,375,285) were excluded from the diluted earnings per share calculation because of their anti-dilutive effect. Options excluded comprised 2,296,500 (2019: nil) vested options and 3,459,640 (2019: 3,375,285) unvested options which have not yet satisfied the required performance conditions for vesting. In the prior period the dilutive effect of vested share options was calculated as the difference in the average market value during the period and the option price giving a dilutive effect of 1,143,000 shares.