This website is dedicated to London and England during the 19th century, with an emphasis on the darker side of Victorian life. All the content of the site comes from primary sources, dating from the late 18th century through the early 20th century.
London: A Pilgrimage, by Gustave Dore and Blanchard Jerrold, 1872
Not specifically about crime, but a fascinating book by Henry Mayhew, primarily concerned with the lives and work of street vendors and costermongers (published 1862).
It's hard to know just how to describe this incredible blog - it's packed with historic tales of London and the Spitalfields area. It's also packed with illustrations - pictures from old publications, Victorian photos, and more. Anyone interested in tales of old London will be enthralled.
Focusing on Whitechapel and the murders of Jack the Ripper - lots of links to useful sites, as well as primary sources describing London during the 19th century.