Hi Richard,
The logo and menu sit within certain blocks of code that are defined to have a specific width within our framework (span12 is full width):
<div id="logo" class="span3 clearfix">
<div id="nav-section" class="nav-indicator span9 clearfix">
You can find those in header.php and modify them accordingly. The logo won’t get any bigger than 270px in a span3 class. If you change the logo div to span4 or 5, make sure to change the nav-section to a span8 or 7, accordingly, so they fit.
Regards,
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Cosmin – Support