One driver told me that you're only allowed onto a static vehicle display if it's being supervised by the driver who brought the vehicle along.
Go North East's display wasn't organised when they first arrived, and that's when me and the person I was with were opening the doors from the button on the side of the vehicle for interior/cab shots. The two demonstrators' doors were left open, but the rest had their doors closed.
I got to the Cobalt Connect and was told the above, so didn't bother with the OK Way's interior.
Members of the public were generally speaking quite appreciative that the doors were opened and such (vehicle doors and cab doors alike) because their children could then sit in the cab seat.
Don't know what the official rule is though! I don't recall being supervised when destinations were being changed in Geminis! :p
RE: Go North East