Watford is near London, but not considered part of the Greater London area.
Yet, the town is inside the M25, has a London Underground Tube station, has red double-decker buses and **Metropolitan Police. Therefore it is considered part of the Metropolitan area of Greater London, and is well within the commuter-belt.
**Wrong! Metropolitan Police do not serve Watford. Watford is served by The Hertfordshire Police Constabulary.(Improved/Edited by Justinleeldn)