roundabout including a cinema, roadhouse and around 40 shops. As with Elstree South, the architect appointed to design the station was Charles Holden. Construction work on the Northern Heights project began in the late 1930s but was suspended by the outbreak of the Second World War. Most of the work undertaken to that date had been carried out on the existing LNER branch tracks but work between Edgware and Bushey Heath had started in June 1939. The route of the line had been cleared and laid out and some earthworks and tunnelling carried out between Edgware and Elstree South. Following the outbreak of war in Europe, work on the extension was suspended in September 1939 and was formally terminated in December of the same year as wartime funding restrictions would prevent completion. Construction of Bushey Heath station had not started when the Second World War began. During the war years, the LPTB-owned land was used for farming vegetables for staff canteens. Work on designs for the station continued during the war to make changes required to account for Ministry of Transport plans to modify the roundabout to include an underpass. This moved the station from the east side of the roundabout to the north side with the lines running under Elstree Road. The revised arrangement would have allowed a continuation of the line beyond Bushey Heath. Cancellation The sites of all three new stations were in semi-rural locations and, as had happened elsewhere, it was intended that the opening of the new section of Underground line would stimulate the construction of new residential estates that the stations would then serve. After the war, however, new legislation was introduced with the intention of limiting the continuing expansion of urban areas into the surrounding countryside. This legislation created the Metropolitan Green Belt around London and the area designated included the area covered by the new Northern line extension. Without the possibility of constructing the new housing estates, the new line had no purpose and the plans for the extension were cancelled in 1950. During the war, the depot buildings were used for the construction of Halifax bombers and the land owned by London Underground at Bushey was used for farming. After the abandonment of the extension plans, the depot buildings became Aldenham Bus Overhaul Works. As a result of the breakup of London Transport Buses and the devolving of maintenance functions to