Originally Posted by
G-BOAC
Like for like or for better, if I'm asked politely I have no problem with it generally and have swapped in the past..
Spot on.
I've only been asked twice times and on both occasions it wasn't done politely ("I take it you don't mind if..." Well, I do mind actually!) On each occasion I moved, but only after thoroughly embarrassing the other person with a comment about their presumption and bad manners.