That's untrue - Good rescues offer lifetime back up and in fact have agreements that you sign saying if circumstances change the dog will go back to the rescue.
I'm not for one second saying this could happen with this dog but what happens if a dog from a foreign rescue doesn't work out for the new owners? Does it go back to the country it came from (I think not) or does it place further burden on the already full to bursting English rescues? (which is already happening)
I wish you all the best with your new arrival and hope he gets on well with your similarly aged other rescue 
This is so very very true. Not only will a good rescue offer free advice for the lifetime of the dog, including sometimes 1-to-1 training sessions, but will
always take the dog back if things don't work out. If they are full to bursting, they usually have a waiting list of dogs whose owners want to hand them over, but a dog coming back to the rescue will jump the list and go in the next available kennel.
Re rehoming from abroad, I guess a dog is a dog getting a home regardless of where it's from. Sometimes though, I do think the money spent transporting these dogs to the UK (whose rescues are indeed full to bursting) would be better spent carrying out a massive sterilisation programme in the country of origin, or trying to educate and alter local culture with regard to it. Just my opinion.
Best of luck with your new little one anyway, and sorry if I've gone off topic.
