Ahhhh was thinking a bit more closer to home Julius south London
Oh I don't know about South London but I know that the 99p shop in Edgware has a range of "Yardley" soaps at 99p each.. They look very posh, but I didn't try them as I notices on the ingredients list was "tallow." I don't know what tallow is but recall hearing it is not good. Here is a link to the range of Yardley soaps. I would suggest looking in TK Max as they often have savon de marseille there.
http://www.yardleylondon.co.uk/english-rose-luxury-soap.html