UK - No constitution. You get huge massive 180 degree changes in things, outlawing things once legal, legalizing the illegal, depending on the current “mood” and degrading culture shifts. Nothing to point ot and say “you can’t do that” and use it as a basis to challenge it in court.
Actually the UK does have a constitution, it is a looser one though.
http://en.wikipedia.org/wiki/UK_constitutional_law