Thanks I've gone ahead and installed the [OzzModz] Social Media Icon Links In NavBar plugin.
It gives a direct link to the page so that's OK.
The like button I've added in the header template, just before this:
PHP Code:
<div class="ad_global_header">
{vb:raw ad_location.global_header1}
{vb:raw ad_location.global_header2}
</div>
<hr />
It shows the like button now next to the FB connect button.
Not bad. Here is the result: