I would imagine you could get new RV appliances in England that would fit and be a lot more economic than buying new ones here and having them shipped across the pond. If you want to stick with original vintage appliances, that's a different story...but harder to find/maintain.
Another thought...Propane appliances would probably be okay, but what kind of electrical modifications would need to be made if they are american-wired?
Good luck in whatever you decide to do ~
Shari