Safari wont load some websites. FF and Chrome do...

I was just after a bit of help if you have a minute.

Today safari decided it doesn't want to load certain websites. Some websites such a BBC news work. Others such as a page needed to accept a job offers do not.
I first thought it was my network however I can access the sites fine from an iPhone and Windows laptop. I can also access the site from FF and Chrome on my mac.

I have disabled the firewall, rebooted my mac, rebooted my router, reset safari, delete preferences and cache in Library. I have disabled plugins and extensions to no avail.

Is there anything more I can do short of a clean install?

Thanks.