Cockney

Cockney is the working-class speech of London, and particularly associated with the East End. It is considered to have had a "formative influence" on Australian English and on New Zealand English.

It is not to be confused with Cockney rhyming slang.

Characteristics
A non-rhotic dialect, one of its most outstanding features is th-fronting, that is, the pronunciation of "th" as "f" or "v". Thus, /θ/ becomes /f/ (for example, three is pronounced as [fri:], i.e. like free) and /ð/ becomes /v/ (for example, mother is pronounced as [mʌvər]). Another typical feature is that of dropping the aitches, but contrary to popular belief, this is not exclusive to Cockney and can be heard in many parts of in England and Wales.