the first car parking service is a true Meet and Greet offering, this means you simply drive to Gatwick airport and get met outside the departures terminal and your car is parked for you, allowing you to just go straight into check-in. Also on your return your car will be waiting for you outside the arrivals building.
with regard to the Meet and Greet on Return service, this does exactly what it says, you park your car yourself on arrival at Gatwick airport but it will be waiting for you on your return outside the arrival building. The good thing about this option is that it cost quite a bit less than full meet and greet parking at Gatwick airport.
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UK Airport Car Parks. A True Comparison Site.