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I know there was a lot of frustration around UK geo-location, but I wasn't aware that it impacted google.com searches as well as google.co.uk searches. It only makes sense for google.com searches made from the UK to include - and even feature - .co.uk domains. I'm glad to hear that you're seeing that happen.
More appropriately, I don't think my rankings dropped so much as there seems to be another 5-10 UK based sites now ranking ahead of me. UK sites that I don't think were there before.
You mean a few co.uk's of yours?
Have you checked the rankings on google.co.uk before switching to .com? Cleared the cache and cookies? Browser's default (english) languages? Tried the same query from another PC?
Yes to all, including from different ISPs. I think a big update is coming (or a small shake-up) aside from the ordinary move. The returned results on one of the keywords I monitor jumped three-fold...