Elliott Brothers (London) Ltd was an early computer company of the 1950s and 60s in the United Kingdom. It's descent can be traced from a firm of instrument makers founded by William Elliott in London around 1804. The research laboratories were based at Borehamwood, originally set up in 1946. 

The first Elliott 152 computer appeared in 1950. The well-known computer scientist Sir Tony Hoare was an employee there from August 1960 for eight years and wrote an ALGOL 60 compiler for the Elliott 803. He also worked on an operating system for the new Elliott 503 Mark II computer, although this was unsuccessful and abandoned along with "over thirty man-years of programming effort."

The founder of the UK's first software house, Dina St Johnston, had her first programming job there from 1953-1958.

John Lansdown pioneered the use of computers as an aid to planning; making perspective drawings on an Elliott 803 computer in 1963, modelling a building's lifts and services, plotting the annual fall of daylight across its site, as well as authoring his own computer aided design (CAD) applications.

In 1966 the company established an integrated circuit design and manufacturing facility in Glenrothes, Scotland, followed by a MOS semiconductor research laboratory. The Glenrothes site was closed in 1969 following the take over of English Electric by GEC.

Elliott 903

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