If you get through in the minimum 45hrs (some do, most don't) you'll probably bend the best part of £6k all in.
Hours building prices vary enormously, but the states is by far the cheapest. Anywhere between £7-10k I'd guess, depending on what you fly, and that's flying only. Then you've got accomodation etc to deal with. When all is said and done it may work out cheaper and more convenient to join a no-equity group in the UK and fly it at your convenience.