However, I did speak to someone at the Japanese embassy in London (UK) and a guy there said that I would need to be 30 at the time of entry to Japan. This is obviously what I didn't want to hear.
....At the same time he didn't seem 100 percent convinced that I would be turned away if I had
just turned 31.
The whole thing is still a bit concerning for me to be honest! Still not sure what the best way forward is.