I left this up, hoping someone else in your situation would be able to advise you. Looks like you are in a more unique situation than you might have thought... at least as far as the users here are concerned.
I do have an answer for you, however:
Decide on a list of the universities your would like to consider attending. Contact the admissions departments at each and see what programs you qualify for.
Depending on where you live in the US, college in the UK could be very expensive compared to what you are used to. Living expenses are much higher there overall.
As far as being easier to visit there... well, customs should be easier to clear, given that you are a citizen of the UK. I don't even know if you need a visa, but I wouldn't think so.
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