I have to admit to not being very knowledgabe on this subject, but the first thing which occurs to me on reading your post, besides what Booke has already said, is the possible tax implications if your aircraft should be deemed to be based here. Personally, I would find someone in the UK who deals with aircraft imports, and get some professional advice.
The next thing which occurs to me is that you seem to be thinking about ferrying your aircraft across yourself? I take it you already know what a huge undertaking that is? There are a few people on these boards who know plenty about the ferrying business, and I'm sure you'll get plenty of relevant advice from them.
If you've not done any private flying in the UK before, you will find it a little more restrictive than in the US, but very rewarding in spite of (or maybe because of) the differences - good luck!
FFF
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