Yes, despite the fact that the problem occurs in Outlook, it appears that the fix is to go in to Internet Explorer, File > Page Setup and then amend the margin.
Wouldn't it be more helpful if this setting could be accessed directly from within Outlook. Thanks Microsoft! (If anyone knows a way that this can be accessed directly from within Outlook then feel free to 'put manners on me.')
Anyway, thanks for your help, it was just another of those frustrating problems with a simple solution.
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