Reference

Before the 1963 reforms, the areas that were constituent parts of Greater London were historically part of the counties of Middlesex, Essex, Surrey, Kent, and Hertfordshire. The River Thames was a defining geographic feature of the area. There were also 28 Metropolitan Boroughs within the London County Council area, plus the Corporation of London. The London Government Act 1963 reformed and expanded the county of London to match the area of the new Greater London Council, which included these boroughs and the City of London. Here is a visual representation of how London was divided into 28 London Metropolitan Boroughs prior to the 1963 London Government Act: . This image provides a clear illustration of the areas that were constituent parts of Greater London before the reforms.