People here in Indonesia often comment when I get back after a trip back to the UK how different my accent (when I'm speaking English -- I have such a thick English accent when speaking Indonesian that the differences are probably undetectable) sounds from the way it sounded before I went away. I think people's accents tend to "drift" towards that of the people around them but exposure to their "home" accent quickly sends them back to their starting point.

Bingley

Bingley