Heathrow isn't really one airport. It's four terminals spread over a site bigger than some towns. Terminal 4 sits on its own on the south side. Terminal 5 handles most British Airways flights and feels like a world of its own. Terminals 2 and 3 share the central area, and the walk between them can catch people out. Head to the wrong one and you've lost 20 minutes before the journey even starts. Our chauffeurs do the Heathrow run every week. They know the arrivals layout at each terminal, the quickest way onto the M4, and when the A4 is the smarter call. That local knowledge is what turns an ordinary Heathrow airport taxi transfer into a ride you don't have to think about.