This relates to the question in:

http://stackoverflow.com/questions/1599717/conditional-directoryindex-in-htaccess

The answer states that the following should work:

SetEnvIf Remote_Addr ^127\.0\.0\.0$ owner
<IfDefine owner>
    DirectoryIndex index.html
</IfDefine>
<IfDefine !owner>
    DirectoryIndex index.php
</IfDefine>

I am not sure this works, the setting of the Env var deffinately does, but no matter what IP I visit the site from the DirectoryIndex is always index.php

Is there something wrong with the conditional or should I be using something else?

Thanks in advance