Curiously there's a borough called Camden in North London. It's about the same as you describe for Camden, N.J, and certainly not a nice place to be at night.

Nick,
Sorry to hear about your troubles. I guess I've been lucky as I've never suffered anything more than an odd screwdriver or pair of pliers disappearing on site, but then I don't usually do work in any of the big towns. Nothing would induce me to live in anything other than a rural area any more.