it is thought the Germans had detected Nazeing as a decoy site by the end of December. The site probably closed by the end of July 1941 as land was needed for increased agriculture and this was put to the plough in August 1941. These bunkers can be located north of the Nazeing Brook on the Lodge Farm side. Industry and commerce For most of its history Nazeing has been a rural parish with agriculture as the main occupation. The river Lea on the west and the forest on the south provided additional employment. During WWII Nazeing as part of the Lea Valley became increasingly important providing the country with much of its fresh salad produce. The Lea Valley also had numerous factories geared to aircraft repairs, furniture manufacture, agro-fertilisers, as well as power stations and breweries some of which were located in and around Nazeing. During the past forty years in Nazeing there has been considerable development of market gardening and light industry near the river. Hillgrove Business Park Nazeing is home to Hillgrove Business Park, a medium size industrial estate which holds over 30 companies. Market gardening and nurseries The Lea Valley, particularly around Nazeing, is associated with market gardening, nurseries and garden centres. The industry once dominated the area in and around the village, this also spawned industries such as Pan Britannica Industries and L F King & Son Ltd. In the 1930s the Lea Valley contained the largest concentration of greenhouses in the world. Today, in most parts south of Cheshunt the greenhouses have been replaced by residential areas. Nazeing Glass Works Nazeing glass works – Glass making started on the site in 1928 when members of the Kempton family relocated their small glass works from Southwark in London to Nazeing. Nazeing Glass Works is one of the oldest surviving glass manufacturers in the UK and can identify itself in glass manufacturing history back to 1612 in Vauxhall. The registered company Nazeing Glass Works Limited was formed in 1931. In 1956 it was described as having one four-pot, four single-pot and one tank furnace all fired by heavy fuel oil. Gravel extraction The other major land use in the area is gravel extraction which has been carried out for a number of years by Redland Gravel Company and other companies. Throughout the area evidence of this extraction can be seen in the form of flooded gravel