	There is an expression, "North of Watford", meaning locations north of Greater London. Alternatively, "North of Watford Junction" was used with similar meaning referring to Watford Junction railway station's position as the last urban stop on the main railway line out of Euston. The phrase's original use pre-dates the M1 motorway Watford Gap services but current use may refer to either Watford or the Watford Gap services.