It seems like a huge number of people from Britain are going/have been to teach in China. I only know one friend of a friend who didn't like it, everyone else seems to have had a great time. It should be noted that you don't need a "teaching degree", like a PGCE, in order to teach Enlgish as a foreign language. Most places require you to have a TEFL qualification of some sort, though, but that's usually a 100 hour course or less.

I interviewed for the JET programme this year, which involves being an English language teaching assistant in Japan for a year (or more, if you like). They require (and give) no real training, operating on more of a "work it out for yourself" sort of principle. I'm sitting here biting my nails until April when they'll let me know if I'm in or not.