Also depends what for which helciopters you are rated and on which you wish to instruct. If you're a Schweizer chap, there's Sterling in Norwich who do the FI course. The instructor there is not called Mike though, he's called Roy!
I haven't flown in the US so can't really comment but I suspect procedures and airspace regs are quite different as is RT. You've only got 10 hours to go, that's not much so I would recommend getting a few hours in with an instructor to familiarise yourself with what's what. I don't think many (any?) scholls would let you self-fly hire anyway without that.
All the best and welcome to Blighty!
Cheers
Whirls