Hi!
A (4yr) UK degree is worth something for sure. It'll basically open your door to obtaining a work visa for teaching English in Japan.
Is it possible to get a work visa from an English school without a degree? Anythings possible but the odds are heavily against you. Especially in this Japanese economy where there are tons of people like yourself (with degrees) who are scrambling to find a teaching job so they can remain in Japan.
My advice to you is to obtain a university degree since nothing opens doors (especially in Japan) like a degree.
Even if you slipped through the cracks and found a job in Japan, the lack of a degree will consistently come back to haunt you every time you're up for promotion, searching for another job, etc.
Keep your chin up! You're what? 20 yrs old? I'm almost double that age and I'm thinking of moving to Japan.
