you can just drive over the grass if it shut as you come down just before the brick hut on left drive over grass there. loads of people do it and never a problem with cars.
always ok he opens gates about 8am i think but we have parked there from 6am before you could park opp chippy on front but will have to move before traffic wardens come out so i would just drive over grass park and then no worries of having to come off to move.