Max Power wrote:
http://en.wikipedia.org/wiki/Bow_Bells

And, to quote directly from this wikipedia link:

"It is said that to be a true cockney, you must have been born within
earshot of the bells."

This is the commonly accepted definition of a cockney, and not unique
to wikipedia.

The bells of the parish church of St Mary-le-Bow cannot be heard
throughout the City of London, so there are true Londoners who were not
born within earshot of the Bow Bells.

I shall refrain from childish insults, no matter how obvious and
relevant.