[Columbine]

Depends what your motivation is. I don't understand people with no real incentive to work in Japan other than "zomg, I love Japan".
I want to work out there, but neither long term nor for a vague reason. I want to improve my Japanese to work towards other long term goals, and I've hit a stage where immersion would be the most beneficial to do this. I also want to teach English and gain experience in that capacity. I could go to other countries, but it would be less beneficial to go outside of Japan as I could easily wind up in an area where I speak no language of any use and have even less access to Japanese. I also have a lot of friends living in Japan; I have contacts there who would support and help me. Outside of the UK, working in Japan just makes the most sense.