All the boundaries for East London and Essex have changed. The last major boundaries changed in 1965 when London grew to be known as what is today called Greater London. Which includes all of the city of London and everything around it but also has eaten into London's bordering counties. Whether you like to accept it or not these places are now also part of London as they have been swallowed up into the Greater London sprawl. Making places like Barking, Ilford, Chadwell Heath, Dagenham Elm Park, Romford, Hornchurch etc part of East London as they form into the eastern part of Greater London. These places are also full of Cockneys as they have moved here from places like Bow and Whitechapel due to immigration.