Joe Orton is a sell out playwright, but there is a dark story-ending to his glittering ability (he was murdered by his partner) and the much reported court case of Islington Libraries combine with this public toilet in South End Green, Hampstead (picture right and interior below left).
http://en.wikipedia.org/wiki/Joe_Orton
http://www.joeorton.org/
This is the only toilet still in use that Joe Orton is confirmed as having 'used' and so it enjoys something of a touch of notoriety...
http://www.qxmagazine.com/pdf/gayhistory-north.pdf
But the wall to ceiling tiling has a dramatic gleaming effect and combined with the black pediments creates an almost gothic victoriana to them.
I have done a note to the Joe Orton website - link above - asking them to reflect North West London in their photo gallery of associated Orton places and features. We shall see what happens, but pop down to South End green and have a look - a brief look.