Probably would have to live in the UK for longer but for my current short stay, I felt that it costs much cheaper to live in Japan. Some folks write horror stories about how apples in Japan costs
5000 yen each. If you want a
5000 yen apple then you can certainly find one but that's not what they cost normally.
Decent one room apartments in central Tokyo can cost from about
50000 yen per month. Will talk more about the cost of living separately. How did you feel about the price of food and travel when you visited Japan compared to where you live?