Harry,
If you open the HTML file produced by Save as Web Page, you'll see a <STYLE>
tag in the META data at the top of the file. Within the style tag you'll find
an entry for TH (table header) and one for TD (table data), each of which
includes "text-align: right". If you change it to "text-align: left" you'll
get the desired result.
However, I realize that this requires you to post-process the generated HTML
file. I haven't found a way to alter the default setting before the report is
produced. Might be hard coded, might be stored somewhere that you can alter,
but if it's the latter, it certainly isn't obvious!