[baileyom2011]

Thanks Max.

I disabled Plugins/Hooks and it did disappear, so I'm guessing this means it is a plugin still controlling the button. Strange thing is I can't see a plugin in the list that has anything to do with it, but I guess I will disable each one at a time and see if any effect it.

UPDATE:

Ok, i've gone Plugins & Products > Plugin Manager > Nav Tab

and then removed the code

<a href="http://www.onlinemarina.co.uk/boatsales.php" class="navtab">Boat Sales (Coming Soon) </a></li>

which just leaves

$template_hook['navtab_end'] .= '
';

It seems to have worked, but just checking that is a ok / safe way of doing it. Thanks.