1. Be careful to get a visa if you want to work in the states. Your US employer can't usually get one for you as a flying instructor so you will have to be recruited to a job which needs you to have some sort of higher educational qualification (of course it goes without saying that the job would need you to have a flying instructor rating too - eg marketing director of a CAA approved flying school!).
2. There are plenty of part-time instructing jobs around in the south east but I know a few people who have had problems getting full time posts. The best way is to go visit clubs and talk yourself in.
3. The industry needs new instructors who really want to teach instead of just seeing it as a painful step on the way to something "bigger and better" - so I, for one, send you lots of good wishes for success in finding a school in which to teach. Don't give up - the opening is out there somewhere.