I've started to think about this too. Where to retire. Could feasibly do it UK, NZ or Australia but the last two have insane property prices, anywhere decent with good healthcare nearby anyway.
Actually think I may have to retire to the UK. Watch a bit of Escape to the Country as parts of it dont seem too bad! I know you cant improve the weather that much but some parts of England, Wales or Scotland clearly an upgrade from Greater Manchester.
Ask @Smiley how his move has gone.