Is there an answer to this London Underground question and, if so, what is it?

Question

Of all the platforms on the London Underground system, how many are serviced by the doors opening to the left and how many to the right?

Answer 1

1,000,002 to 1,000,001

Answer 2

It doesn't matter, you should always go through an open door no matter which way they open. Going through a closed door can hurt your nose and for a woman, perhaps b*****s.

Answer 3

How are you going to classify Barking, where, on one platform, the doors open on BOTH sides!