Worst.. a toss up between Kinloss cause I hated the job and a few of the people or MPA on Ilas Malvinas cause its there (though I have some great times there, but it is a bit of a dump).
Best, well Leuchars is a great place and the best place I have ever been posted to. As an aside, although not an RAF base, but its on UK soil, the mess at Diago Garcia is a difficult place to bet for sundowners!!
Tonks