I'm an ex-instructor at Ocean Helicopters in West Palm Beach, FL.
Not affiliated with them, I'll keep this brief so as to not sound like an advert.
Good school, and on the East Coast.
When I was looking at training locations Oregon looked great, but didn't fancy the downtime during the winter.
At Ocean, we had loads of people from the UK come over on scheduled time off, then return, and so on, so they know exactly where you're coming from.
Also, a LOT of the instructors are of UK/Ireland origin, in fact one of the more experienced guys is JAA certified (even though the school isn't), at least there's some synergy there.
As far as professional goes, PM me and I'll give you some of their repeat customers.