no more Cockney in London ....

First of all to the people who doesnot know what is Cockney dialect :
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To be a true Londoner - A Cockney, you have to be born within hearing distance of the bells of St. Mary Le Bow, Cheapside, in the City of London 'Cockney' or 'cock's egg' was a 14th Century term applied contemptuously by rural people to native Londoners who lived rather by their wits than their muscle. Today's natives of London, especially its East End use the term with pride - 'Cockney Pride'.
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Janik, sorry to dissapoint you but I have talked about it to my landlord who is a news redactor at BBC and he tolled me that there are very few people left who actually use this dialect. Cockney dialect is very difficult to understand and is almost forgotten. He has tolled me about some other dialect which is famous now in London ... I will write about it next time ...

and this what I found in wikipedia about it :
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Today, the traditional form of Cockney rhyming slang seems to be dying out amongst young people, as it is being replaced with slang and patois brought to London by Afro-Caribbean immigrants, many of whom reside in the East End. However, some terms such as 'rabbit' (rabbit and pork = talk) are still in common usage.