I didn't realise the Photographers' Gallery is 50 years old. But it is. Obviously.
Good piece in the New York Times about it. (Link, possible paywall I'm not sure how that works on the NYT.)
Our hero James in a previous exhibition Seamless Transitions.
The Photographers' Gallery have a nice bit on their website 50 Exhibitions for 50 Years.
And let's not forget the great logo by North.