Virante SEO tools tells me Default Page Check: FAILED

Hi just ran my site through http://www.virante org/seo-tools/ everything passed apart from this
Default Page Check: FAILED
You have not standardized your default pages meaning the following versions of your url return a 200/OK Header, which may cause duplicate content issues. The following extensions work:
http://www.rvsolarsystems co uk/index.php
http://www.rvsolarsystems co uk/
Got the same result with the default template so I don't think it's a template issue, should I be worried and if so how can I resolve it. Cheers
zencart 1.5.1
Comstock template

discoverytdi:

the following versions of your url return a 200/OK Header, which may cause duplicate content issues. The following extensions work:
http://www.rvsolarsystems co uk/index.php
http://www.rvsolarsystems co uk/

This is normal/standard web-server behaviour.

discoverytdi:

should I be worried

Yes, worried that this 'seo test site' is giving a 'failed' response when it has no reason to do so. (What else is it doing wrong?)

discoverytdi:

and if so how can I resolve it.

Nothing to fix. This is normal/standard web-server behaviour.

Cheers
Rod

Cheers for that Rod can you recommend a reliable site then.

discoverytdi:

Cheers for that Rod can you recommend a reliable site then.

These online "SEO Audit " tools are one of the biggest scams on the internet. OF COURSE your site will FAIL something !!! How do you think these scams make their money?

They spin you a whole lot of techno-babble - all of which looks pretty impressive - then they tell you that the site has a major problem.

Many people then click the link (usually close by) that says "Click here to get us to help you fix this".

Never click those links.

Just as I suspected snake oil