Harlow was a village to the north of the industrial areas of east London and on the London to Cambridge railway. It was chosen as one of the new towns designed to relieve the pressure on greater London.
As with other new towns, it sought a spread of industry to avoid the concentration that caused problems in Corby. Although it was not thought suitable for heavy industry, two of its early arrivals were on the heavy side : Johnson Matthey the precious metals company and United Glass manufacturer of bottles.
They were followed by Revertex resins, and Schreiber furniture founded by a Polish immigrant, which would compete with Lebus and Hille and become part of GEC Domestic appliances before moving to MFI and finally Sainsbury.
Shenval Press were an early arrival joined in time by book binders Dorstel Press. Publishing later received a major boost when Longman Green arrived in the late sixties. Thanks to Bill Henegan for his memories of the CWS biscuit factory.
Standard Telephones became the largest employer in the town with 3,000 at one time. They were joined by the Standard Telecommunications Laboratory. Another electronics business came to the town by default after de Havilland had to cancel a new factory as a result of cuts in defence spending. Cossor was moving out of valves into radar and so needed new premises; they later became a subsidiary of the American Raytheon Corporation. The AEI research division was based in the town but moved to Manchester when AEI joined with GEC.
American office equipment manufacturer Pitney Bowes moved their manufacturing in 1962 and head office a year later. They were joined by Minnesota 3M Research and educational suppliers ESA.
In the sixties, Gilbey’s Gin built a striking new factory moving its production from London. The family had a long connection with the former village. Gilbey became part of International Vintners which was bought by Grand Metropolitan. The Gilbey brand is now within Diageo. Rank Hovis McDougal built an administrative headquarters. GSK has a research facility in the town.
Beecham Research Laboratories were established here in 1969 building on the work of the first laboratory near Crawley.
Further reading:
Frederick Gibberd, Ben Hyde Harvey, Len White Harlow: The Story of a New Town (Stevenage: Publications for Companies, 1980)

this omits the biscuit factory, co-op. As I understand it that was the first factory to open in the new town.
closed 2002 and then demolished, shame as it was an interesting building
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I would be very interested in the name of the biscuit maker.
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CWS (co-operative wholesale society) I believe was the original name. Was owned by burtons biscuits for the last 2 years
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