From http://www.thecabby.co.uk/ by way NPR:

The traditional accent of East London, known as Cockney, is disappearing because of population shifts, according to researchers.

A study by the British Broadcasting Corp. found that young people in the East End of the city speak in a dialect combining elements of Bangladeshi and Cockney, reflecting the changing make-up of the area.

This is very exciting for linguists, the language of London is changing,'' said Sue Fox, a research fellow at Queen Mary College, University of London, who carried out the study.

In East London ''the majority of young people of school age are of Bangladeshi origin and this has had tremendous impact on the dialect spoken in the area,'' Fox said in a press release.

Researchers carried out a nine-month study of young people at a youth club in the Tower Hamlets borough. They found the size of the area's Bangladeshi community had direct influence on the local dialect.

Words such as 'nang,' meaning good, and 'creps,' meaning trainers, have been adopted by white children with Bangladeshi friends, the researchers said.

The accent is not disappearing altogether. Laura Wright, a senior lecturer in English at the University of Cambridge, said Cockney was moving to towns outside London.

BTW any other NYT Sunday crossword fans get a chuckle this week over the clue "Cockney residence" (or something like that), the answer being "ome"?