Here is a discussion thread from the East Dulwich Forum about the young men who come to the door in the evenings selling things they say are for an organisation for the unemployed.
They have been around for years and can be abusive if you don’t buy.
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Turney and Burbage Roads 
One reply on “Doorstep selling by abusive youths”
Thanks for the post about the doorstep sales. It seems to have got worse recently with people trying to sell house improvements, and innumerable “chuggers” trying to get you to sign petitions and hand over donations for a variety of charities, often on very cold nights. They know you are probably in on a very cold night and expect you to stand there while they burble on. It’s got to the point where I often go and check via windows before opening the door or don’t respond at all. Genuine people will email, phone later, leave a note or catch you in the Village. Have noted that some people now have entryphones and wonder whether that is the way forward? What does everyone else do?