Hello Dave
I am also using PS1.5.4.1 with Nice & Clean skin. You can this by adding comment in your \modules\blockpermanentlinks\blockpermanentlinks-header.tpl
Just replace the code
<li id="header_link_">
<script type="text/javascript">writeBookmarkLink('{$come_from}', '{$meta_title|addslashes|addslashes}', '{l s='bookmark' mod='blockpermanentlinks' js=1}');</script>
</li>
with
{*<li id="header_link_">
<script type="text/javascript">writeBookmarkLink('{$come_from}', '{$meta_title|addslashes|addslashes}', '{l s='bookmark' mod='blockpermanentlinks' js=1}');</script>
</li> *}
Regards
Abhishek