Medical takes ages because your sitting around waiting for most of the time.
I flew Glasgow to Gatwick and back on the same day so it was no bother. NATS will cover the expense too.. .Dont worry about the eyesight test - you wouldnt have even got an interview if your prescription wasnt within the limits.
No nasty surprises - No fingers up bums or anything like that. just make sure you're wearing clean undercrackers <img src="tongue.gif" border="0">