Acorn Computers Ltd was a British computer company based in Nottingham, England in the United Kingdom. It licensed, in early 2006, the dormant Acorn Computers trademark from French company Aristide & Co Antiquaire De Marques. This company sold IBM PC compatible computers and had no connection to ARM, a spin-off from the original Acorn Computers.

Alphamosaic Ltd was a UK semiconductor company specialising in low power mobile multimedia processors, based on their VideoCore architecture. Alphamosaic was founded as a spin out from Cambridge Consultants, by Robert Swann and Steve Barlow in 2000, supported by venture capital from Prelude Trust, ACT and TTP Ventures.

Cumana, based in Guildford, England, was a manufacturer of educational computer products. Among its best-known products were disc drives for Acorn, BBC and Oric computers.

Dragon Data was a Welsh producer of home computers during the early 1980s. These computers, the Dragon 32 and Dragon 64, strongly resembled the Tandy TRS-80 Color Computer ("CoCo")—both followed a standard Motorola datasheet configuration for the three key components. The machines came in both 32KB and (later) 64KB versions.

Elliott Brothers (London) Ltd was an early computer company of the 1950s–60s in the United Kingdom. It traced its descent from a firm of instrument makers founded by William Elliott in London around 1804. The research laboratories were originally set up in 1946 at Borehamwood and the first Elliott 152 computer appeared in 1950.

Ferranti or Ferranti International plc was a UK electrical engineering and equipment firm that operated for over a century from 1885 until it went bankrupt in 1993. The company was once a constituent of the FTSE 100 Index.

GEC Computers Limited was a British computer manufacturing company under the GEC holding company from 1968 until the 1990s.

Northgate Public Services (Northgate) is a provider of specialist software and outsourcing services for the public sector and is based in the United Kingdom.

Parrot Corporation Limited was a British floppy diskette manufacturer formed in 1983, that operated from Llantarnam Industrial Park in Cwmbran, south Wales. The company was a start-up venture funded by the Welsh Development Agency (WDA).

Tiny Computers was a British computer manufacturer based in Salfords, Surrey, England. The company went into administration due to substantial losses in January 2002 and was subsequently purchased by rival OEM Time Group.

Whitechapel Computer Works Ltd. (WCW) was a computer workstation company founded in the East End of London, United Kingdom in April 1983 by Timothy Eccles and Bob Newman, with a combined investment of £1 million from the Greater London Enterprise Board, venture capital companies Newmarket and Baillie Gifford, and the Department of Trade and Industry. The company was situated in the Whitechapel Technology Centre - a council-funded high-technology enterprise hub - and began the design of their first workstation model in August 1983, shipping the first units by September 1984.