Northolt is popular with customers mainly because it's located where passengers prefer to travel to and from. Oxford is a ridiculously long distance from London to have "London" as a prefix in its name and whilst Biggin Hill is closer, the supporting roads network is poor by today's standards.
If it wasn't the most convenient location, Northolt might be less popular.
I note that Biggin Hill have been advertising a helicopter shuttle to and from London Heliport. They quote a six minute transit time. It might be, measured in a straight line, but not including the time taken to taxi, take off and land.
Last edited by ShyTorque; 13th Feb 2015 at 09:47.