Sometimes during a MailMerge the Currency value from an Excel or other data file is displayed with more than 2 decimal places. This is because it displays the data the way it has been stored for that software.
To resolve this issue do the following:-
1. Open the Word document ( before the MailMerge )
2. Press keys Alt-F9 ( this displays special characters )
3. To the right of the position where the currency value will display
enter £{ mergeformat \\# 0.00 \”p2\”}
Many other options are possible.