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Earnings per share (Tables) | 6 Months Ended
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Jun. 30, 2018
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Calculation of Basic and Diluted EPS | Basic EPS The calculation of basic EPS is as follows:
|  | Six months ended 30 June 2018 |  |  | Six months ended 30 June 2017 |  |  | Year ended 31 December 2017 |
Earnings1 (£ million) |  |  | 672.4 |  |  |  | 596.1 |  |  |  | 1,816.6 |
Weighted average shares used in basic EPS calculation (million) |  |  | 1,250.5 |  |  |  | 1,266.2 |  |  |  | 1,261.1 |
EPS |  |  | 53.8p |  |  |  | 47.1p |  |  |  | 144.0p |
Note
1 | Earnings is equivalent to profit for the period attributable to equity holders of the parent.
Diluted EPS The calculation of diluted EPS is as follows:
|  | Six months ended 30 June 2018 |  |  | Six months ended 30 June 2017 |  |  | Year ended 31 December 2017 |
Diluted earnings (£ million) |  |  | 672.4 |  |  |  | 596.1 |  |  |  | 1,816.6 |
Weighted average shares used in diluted EPS calculation (million) |  |  | 1,259.4 |  |  |  | 1,279.7 |  |  |  | 1,275.8 |
Diluted EPS |  |  | 53.4p |  |  |  | 46.6p |  |  |  | 142.4p |
Reconciliation Between Shares Used in Calculating Basic and Diluted EPS | A reconciliation between the shares used in calculating basic and diluted EPS is as follows:
|  | Six months ended 30 June 2018 |  |  | Six months ended 30 June 2017 |  |  | Year ended 31 December 2017 |
|  | m |  |  | m |  |  | m |
Weighted average shares used in basic EPS calculation |  |  | 1,250.5 |  |  |  | 1,266.2 |  |  |  | 1,261.1 |
Dilutive share options outstanding |  |  | 0.5 |  |  |  | 2.1 |  |  |  | 1.8 |
Other potentially issuable shares |  |  | 8.4 |  |  |  | 11.4 |  |  |  | 12.9 |
Weighted average shares used in diluted EPS calculation |  |  | 1,259.4 |  |  |  | 1,279.7 |  |  |  | 1,275.8 |

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