do you mean petrol stations?
To confuse it even more I have recently been told that you need a license (or something special) in order to operate machinery on a petrol station forcourt. I dont know how much truth there is in this but it makes some sense.
On the insurance side, i would guess that as long as your covered for domestic AND commercial you would be ok. However if anything was to be excluded i can see it being petrol station forcourts.
so not helped at all, sorry!