It doesn't explain my horrific fall in position but the new number 1 position for my main keyword has come from nowhere. Their site has been around for a while but never featured very high. This month it goes straight to number one, at the same time as a PR Newswire press release for the same business also appearing in the number 1 position for relevance on Google News.
If this is all it takes then PR here I come .... :)