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my sites homepage listed for www.domainname.co.uk and domainname.co.uk
There is plenty of advice here how to recify this. Do a search on "htaccess domain" or similar.
As to problems with the home page, I would check it validates (unless you have already done this).
Still, I think Google is having major problems. My main site has been out of the SERPS since Sept. 23, 2004. Last month it came back in and was ranking well. Today it disappeared again and none of the pages are ranking in the top 1000 as far as I can tell (but the index page does come up under the business name where before it didn't). All this despite the fact that I got a couple major links (natural not purchased) and jumped to the top position in my Google directory category (a very large competative category) jumping ahead of all the PR8s (I guess I'll be a PR 8 at the next update... yet still get trounced by off topic junk that's PR 3).
I'd like to forget about Google but, alas, it's so difficult to do with thier market share...