Three phone boxes

Outside the church of Christ the King in Byng Place (although the main entrance to the church is in Gordon Square).
And, guess what, there are railings behind them!

What with one thing and another I didn't manage to find much time to take photos today but fortunately I have a mental list of interesting things in the vicinity of work that I haven't blipped yet and these phone boxes were one of them.
Interesting, I hear you say, really, what a London nerd! But look, each is a different size and design. Why? The history of London phone boxes will have to wait until another day.