Also, like i said, as you are not planning on completing the course in the US, you need to make sure that you can transition back to a UK flight school with the minimum of fuss. Otherwise you will spend whatever you saved going back over old ground and ultimately end up doing more hours than if you tried to get it completed at the same school...
OK. I'd assumed, perhaps naively, that if my log-book has (say) 30 hours signed-off with all the appropriate exercise numbers, then an instructor at my next flight school would do maybe one session to check my skills matched the logbook, and if no particular revision was required, we'd carry on where I'd left off. Is this excessively optimistic?