Even the dictionary definitions are more Mockney than Cockney. The definition below claims a Cockney is an East Ender and someone born within the sound of the bells of St Mary-le-Bow church. Blues who know London well will realise this doesn't hold true geographically!
1. (Peoples) (often capital) a native of London, esp of the working class born in the East End, speaking a characteristic dialect of English. Traditionally defined as someone born within the sound of the bells of St Mary-le-Bow church