The Local Government Act 1933 was an Act of Parliament that consolidated and revised existing legislation that regulated local government in England (except the County of London) and Wales. It remained the principal legislation regulating local government until the Local Government Act 1972 took effect in 1974. Among the innovations that effected government in Outer London (that is the built-up area outside the County of London falling within the administrative counties of Hertfordshire, Kent, Middlesex and Surrey) were: