A Few Things I Wanted to Say
I don't understand why everyone thinks Cockney can only be spoken on the East End.  It seems to be much more of a working or lower class accent found all over London (maybe not "all over", but certainly not just the East End).  If you listen to sound clip for example, you'll hear a man from Peckham.  Peckham is not in the East End, instead it is in South London, and yet he is more Cockney than anyone I have heard in my life.  It says in this article as well that most characters on the sitcom Only Fools and Horses are Cockneys, and yet that takes place where else but in Peckham.  This article also says that Snatch contains Cockney accents and yet Jason Statham who plays one of the main characters in that film and seems to speak with one of those accents, is actually from Sydenham, in south-east London.    

What are some differences between the so-called "South London" (south of the Thames) accent and "North London" accent?  I just find it annoying that locals claim to be able hear differences between the two and yet they never can describe those differences when asked.  It makes one doubt whether such differences even exist.  It's kind of like how New Yorkers claim to be able to distinguish between Bronx accents and Brooklyn accents, Irish New York accents and Italian New York accents, etc., but when asked what those differences are, they can't give you an answer.  It's all b.s. if you ask me.