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In page History of St Albans:

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In the inter-war years St Albans, in common with much of the surrounding area, became a centre for emerging high-technology industries, most notably aerospace. Nearby Radlett was the base for Handley Page Aircraft Company, while Hatfield became home to de Havilland. St Albans itself became a centre for the Marconi plc company, specifically, Marconi Instruments. [4]Marconi (later part of the General Electric Company) remained the city's largest employer (with two main plants) until the 1990s. A third plant - working on top secret defence work - also existed.[citation needed] All of these industries are now gone from the area.