I'm hoping to visit a grocery store (quickly) near Gatwick Airport in between flights. I want to buy clotted cream and cheese to take home. I see there is a Waitrose in Horley (approx 1 mile north) and a Tesco Extra in Crawley, 2.2 miles south. There is also a M and S at the airport....looks small but this would be ideal. There are many buses leaving from Gatwick to these towns but I need some help figuring out which bus goes by the stores to save time.....and which would be the quickest trip. I should have about an hour total to do this trip. We arrive at the north terminal and depart from the south terminal. If you are familiar with the area, I'd appreciate some advice.