We nearly always end up flying from Gatwick, particularly when we're going to Egypt. I usually search Gatwick carparking and take any specials on offer. In July we left our car at North Terminal long stay carpark using the Summer Special, it cost £48 for the fortnight. We left keys along with flight number behind reception desk and hopped on the Summer Special bus which took all of 5 minutes to drop us outside the departures, the bus operates approx. every 20 minutes 24/7. Upon our return our car was ready and waiting and we were back on the road within an hour of landing. It's best to search for offers early as you get better deals. I booked this one about 4 months before our departure