I have literally just called the Japanese embassy in London to check if I would be allowed entry.
Though trip under 90 days so do not need a visa I would have to complete the boarding /entry card which asks about convictions and prison sentence over a year.
Taking we are all willing to comply so; in my case, say yes, I would be refused entry.
On thoughts of my saying NO, I'm assuming I would not get approval by the PPU as they would know /check the above rule.
That's another country off my list.
Learn from yesterday, live for today, hope is for tomorrow else what is left if you remove a mans hope.