I wouldn't leave LH other than for BA in the UK. If you are not happy about what you want to leave, you would be miserable in what you would find.
Your present working conditions are way above any company could offer you in UK (ah, and even EK). Remember, you won't stay young and fit forever!
Stick to pprune for a couple of months and get an idea of what people have to put up with outside the "Big".