Jan
Sorry, I knew when I posted my reply there was something wrong, but couldn't find my 'post it' with newspapers on and have been looking for it since I sent my message. I've now found it and....the South London Observer didn't start up until 1874 but I have no date for South London Press. There was another paper, Illustrated Mercury of South London, but again no date. If you ring Southwark Local Studies Library, 020 7403 3507, I'm sure they'll be able to tell which titles were in print at the time, they're very helpful.
Regards
Sandie