Municipal Borough of Dagenham

From the Wikipedia page :

Dagenham was a local government district in south west Essex, England from 1926 to 1965 covering the parish of Dagenham. Initially created as an urban district, it was incorporated as a municipal borough in 1938. It was established to deal with the increase in population and the change from rural to urban area caused by the building of the Becontree estate by the London County Council and the subsequent movement of people from Inner London. Peripheral to London, the district formed part of the Metropolitan Police District and London Traffic Area. It now forms the eastern sections of the London Borough of Barking and Dagenham and the London Borough of Redbridge in Greater London.