Well eventually I got it looking how I want it. I've attached my code and a screen shot for anyone else it may help.
PHP Code:
ob_start();
include("radio_stats_martin.php");
$martin = ob_get_contents();
ob_end_clean();
ob_start();
include("radio_stats_alex.php");
$alex = ob_get_contents();
ob_end_clean();
$output = "<center><table width='96%'><tr><td width='45%'><div class='cms_widget'>$martin</div></td><td width='10%'></td><td width='45%'><div class='cms_widget'>$alex</div></td></tr></table></center>";
Don't worry about the 'Current Song' text, that's actually a moving marquee. So that's why it looks a little odd on a screen grab.
Thanks so much for your help. I'm learning a lot here, Cheers.