My great-grandmother, Emma Moore, was born in Barnwell in 1843. It was, as described above, a horrible slum. In 1876, the year Emma gave birth to my paternal grandmother Annie Eliza Matthews, in Holloway, North London (also a poverty-stricken area!), a putative cousin of Emma's, Robert Browning, murdered a young prostitute Emma Rolfe on Midsummer Common and was hanged in Dec same year.
I stumbled - almost literally - on Emma's grave in Barnwell (NOT St Andrew the Less graveyard, but a cemetery) earlier this year.
F.T. Unwin, a local resident of Barnwell, has written several books about growing up in the area in the 1920s/30s when it was still a slum.