Wordpress in subdirectory - htaccess issue?

I've installed wordpress in a subdirectory of my OC site called "/articles".

It all works fine, as long as you keep the index.php on the end of the URL.
As soon as you take it off, something in the HTACCESS or OC kicks in and creates a redirect loop (it seems).

So:
http://www.mysite.com/articles/index.php = wordpress home page,
http://www.mysite.com/articles = server redirection error
http://www.mysite.com/articles/ = server redirection error

I've had a poke around with the .htaccess in the main root of the site for over an hour to try and add a Rewrite Condition which says "don't bother re-writing the /articles directory" - but no luck!


Any suggestions appreciated

*I really want to avoid having to hack the OC Seo rewrite php module. It looks like a htaccess issue to me..

Typical, minutes after posting - I find the answer.

It was so simple too, I've overlooked it to many times.

Fixed