Thanks guys,
<SCRIPT LANGUAGE=JavaScript>
<!--
if (top.frames.length!=0)
top.location=self.document.location;
// -->
</SCRIPT>
Done the trick

Another question - is that the only work around? Obviously most TGPs will not allow javascript of any kind, any way to do the same job with htaccess? Or as you say Alex, use htaccess to redirect those domains hits to a specific url?