This unspoken code exists in all societies, though some seem to have more rules than others. I assumed both of them being island nations was a given for most people.


As to being crowded, I would say that Japan is much more crowded than the UK, looking at population densities

(19 for Japan, 33 for the UK), but if you look at Tokyo compared to London, it's no contest. London at 11,000 per sq. mile, Tokyo at 3x that!