For years so called language experts refused to accept they way Londoners speak as an accent or dialect but it is. People tend to forget too the fact that the port of London and London docks were massive for centuries with all the differing nationals and accents that brings. A couple of hundred years ago there were so many ships trying to unload in the pool that it was said you could walk from one side of the pool of London to the other from ship to ship without getting your feet wet.