Article in this month's Flyer (delivered this morning) on this very topic.
Personally, I am surprised that it only takes 2-4 hours to acclimatise to the UK. Imagine: you spend 3 weeks intensive in perfect weather with nice long runways in a 172. Then you come home to an ancient 150 operating out of a 800' bumpy grass runway in Jan, when it's either blowing a 15kt crosswind, or icing at 1000' or both... scary
