Spook I haven't made it along to one of these Cars and Coffee mornings yet, but talking to others who have, it would appear that arriving at 7.30 would leave you out in the street. This may change with the arrival of the winter months, but at this months's (May) event there were approx 700 cars there and the parking lot was chockers by 7.00.
I'm planning on being there on June 3rd. Leaving at 6.00 for what should be only a 30 min journey. The Fred Hollows Foundation is this month's featured charity. I'll find out a bit more about logistics and let you know.