I tried the Feed in the browser: It was displayed, but Opera didn't display it as Feed.
I tried the Feed on a RSS Reader in the Dashboard: RSS Error: A feed could not be found at http://www.safestyle-windows.co.uk/news-rssfeed/news.rss
Maybe the Feed is not valid? http://validator.w3.org/feed/check.cgi?url=http%3A%2F%2Fwww.safestyle-windows.co.uk%2Fnews-rssfeed%2Fnews.rss
Says Feed is valid but suggests to not send it with the "text/plain" media type. Maybe that is the cause of Problems?
Simplepies Demo does not find the Feed: http://simplepie.org/demo/?feed=http%3A%2F%2Fwww.safestyle-windows.co.uk%2Fnews-rssfeed%2Fnews.rss
Feedburner has no probs to eat that thing. I will take a closer look.