Wait? You Mean the Airport Is Not Actually IN London?
You are in England, at the airport, have passed through His Majesty’s Customs and have entered into the Arrivals area of the airport. What will you see? What is next?
First, you’ll see a couple of hundred people holding up signs with names of people, or companies, or organizations, written or printed on paper, or on an electronic tablet. 
If you have booked a driver to take you somewhere (we’ll touch on that subject later.) …