Basic and diluted earnings per share are calculated on the profit on ordinary activities after taxation and on the weighted average number of shares in issue during the period as shown below:

Year ended
31 March 2004
  2004 2003
Weighted
average
number of
shares
m
 
 
Profit after
taxation
£m
 
 
 
 
 
 
 
 
 
 
Weighted
average
number of
shares
m
 
 
Profit after
taxation
£m
Weighted
average
number of
shares
m
 
Profit after
taxation
Restated
£m
488.1 171.5 Earnings per share Basic 500.3 66.1 488.6 75.5
519.0 179.3   Diluted 519.3 66.1 518.9 78.6
488.1 180.6 Adjusted earnings per share Basic 500.3 66.8 488.6 77.0
519.0 188.4   Diluted 519.3 66.8 518.9 80.1

Adjusted earnings per share are calculated by excluding £0.7 million (31 March 2004: £9.1 million; 30 September 2003: £1.5 million) which is the capital allowance effect of FRS 19.

The basic weighted average number of shares has changed as a result of the conversion on or before 30 July 2004 of the 6% Irredeemable Convertible Bonds.