Earnings per ordinary share have been calculated by dividing the profit attributable to equity holders of the parent after taxation for each financial period by the weighted average number of ordinary shares in issue during the period.

	2020 Pence	2019 Pence
Basic earnings per share
– Underlying*	92.50	90.24
– Basic	32.87	30.15
Diluted earnings per share
– Underlying*	92.19	90.01
– Diluted	32.76	30.07

The calculations of basic and diluted earnings per share are based upon:

	2020 £m	2019 £m
Earnings for underlying basic and underlying diluted earnings per share	95.4	92.5
Earnings for basic and diluted earnings per share	33.9	30.9

	Number	Number
Weighted average number of ordinary shares for basic earnings per share	103,133,142	102,504,510
Impact of share options	348,393	257,838
Weighted average number of ordinary shares for diluted earnings per share	103,481,535	102,762,348

* Underlying measures exclude non-underlying items as defined in note 1.

At 30 June 2020, there are 373,439 options (2019: 421,486) that are excluded from the EPS calculations as they are not dilutive for the period presented but may become dilutive in the future.