The photographs span the breadth from the touristy side of London, to photographs of gypsies living in caravans (i.e., that's "trailer homes" for readers in the US). The accompanying well-researched text paints a fascinating history of the city as it grew from a collection of villages into a major cosmopolitan city. The tone of the writing is dark and brooding; most appropriate for black-and-white night photography. The great photographs include references to London's overcrowding, urban blight, loss of historical identity, and recent upswings in street crime (not too surprisingly, Alan Delaney recently moved from London to Melbourne, Australia).
I'm partial towards this book for two reasons. First, I was first exposed to photography (no pun intended) when I was just a wee lad in the late '60's in England. Back then, most photography was still black-and-white, and because I lived outside of London, everything that I remember seemed to be images of downtown London. In fact, even though I was only five years old, I have some recolection of a black-and-white TV montage of London that accompanied Petula Clark's hit "Downtown". So when I came across "London After Dark", everything seemed to come together for me: my faded memories of London, my new interest in night photography, and (the second reason that I love this book) my recent love of film noir movies (which, I recently learned in a film studies class, is a style, not a genre).
You can pick up a used copy of London After Dark for as little as $13 on Abebooks.