Profit and turnover data
|1988 to 1989
|1989 to 1990
|1990 to 1991
|1991 to 1992
|1992 to 1993
|1993 to 1994
|1994 to 1995
|1995 to 1996
Founding and early years
On 25 July 1961, Clive Sinclair founded his first company,
Sinclair Radionics Ltd. in
Cambridge. Sinclair Radionics developed
hi-fi products, radios, calculators and scientific instruments. When it became clear that Radionics was failing, Sinclair took steps to ensure that he would be able to continue to pursue his commercial goals. In February 1975, he changed the name of Ablesdeal Ltd. (a
shelf company he had bought in September 1973 for just such an eventuality) to Westminster Mail Order Ltd. The name was changed to Sinclair Instrument Ltd in August 1975.
Finding it inconvenient to share control after the
National Enterprise Board became involved in Radionics in 1976, Sinclair encouraged
Chris Curry to leave Radionics, which he had worked for since 1966, and get Sinclair Instrument operational. The company's first product was a watch-like Wrist Calculator.
Development of the ZX80
In July 1977, Sinclair Instrument Ltd was renamed Science of Cambridge Ltd. Around the same time, Ian Williamson showed Chris Curry a prototype
microcomputer based on a
National Semiconductor SC/MP
microprocessor and parts from a Sinclair calculator. Curry was impressed and encouraged Sinclair to adopt it as a product. In June 1978, Science of Cambridge launched its
MK14 microcomputer in kit form.
In May 1979,
Jim Westwood, Sinclair's chief engineer, designed a new microcomputer based on the
Zilog Z80 microprocessor. Sinclair Instrument Ltd introduced the computer as the
ZX80 in February 1980, as both a kit and a ready-built.
In November 1979, Science of Cambridge Ltd was renamed Sinclair Computers Ltd.
Commercial success and home computers
In March 1981, Sinclair Computers was renamed Sinclair Research Ltd and the
Sinclair ZX81 was launched. In February 1982,
Timex Corporation obtained a license to manufacture and market Sinclair's computers in the USA under the name
Timex Sinclair. In April the
ZX Spectrum was launched. In July Timex launched the
TS 1000 (a version of the ZX81) in the United States. In March 1982 Sinclair Research Ltd made an £8.55m profit on turnover of £27.17m, including a £383,000 government grant to develop a flat screen.
In 1982 Clive Sinclair converted the Barker & Wadsworth
bottling factory at 25 Willis Road, Cambridge, into the company's new headquarters. Following Sinclair's financial troubles, the premises were sold to Cambridgeshire County Council in December 1985.
In January 1983 the ZX Spectrum personal computer was presented at the
Consumer Electronics Show. In September the Sinclair
television was launched, but was a commercial failure.
In 1983 the company bought Milton Hall in the village of
Milton, Cambridgeshire, for £2m, establishing its MetaLab research and development facility there.
In late 1983 Timex decided to pull out of the Timex Sinclair venture which, due to strong competition, had failed to break the United States market as expected. However Timex computers continued to be produced for several years in other countries. Timex Portugal launched improved versions, the
TS 2048 and
2068. That company also developed and launched the FDD 3000, a
floppy disk system, although it was not well received by the market.
Sinclair QL was announced on 12 January 1984, shortly before the
Apple Macintosh went on sale.
 The QL was nowhere near as successful as Sinclair's earlier computers. It suffered from several design flaws,
Your Sinclair noted that it was "difficult to find a good word for Sinclair Research in the computer press".
Fully-working QLs were not available until late summer and complaints against Sinclair regarding delays were upheld by the
Advertising Standards Authority in May of the year. (In 1982 it had upheld complaints about delays in shipping Spectrums.) Especially severe were allegations that Sinclair was cashing cheques months before machines were shipped. In the autumn Sinclair was still publicly predicting it would be a "million seller", and that 250,000 would be sold by the end of the year.
 QL production was suspended in February 1985, and the price was halved by the end of the year.
The ZX Spectrum+, a repackaged ZX Spectrum with a QL-like keyboard, was launched in October 1984 and appeared in
WHSmith's shops the day after release. Retailers stocked the machine in large numbers in expectation of good Christmas sales. However, the machine did not sell as well as expected and, because retailers still had unsold stock, Sinclair's income from orders dipped alarmingly in January. The Spectrum+ had the same technical specifications as the original Spectrum. However, an enhanced model, the ZX Spectrum 128, was launched in Spain in September 1985, with development funded by the Spanish distributor Investronica.
 The UK launch was delayed until January 1986, because retailers had a large amount of unsold stock of the previous model.
At the January 1985 Las Vegas Consumer Electronics Show, Sinclair re-entered the United States market, announcing the "FM Wristwatch Radio", an
wristwatch with a
 However, the watch had several problems and never went into full production.
Sinclair had long had an interest in electric vehicles, and during the early 1980s he worked on the design of a single-seater "personal vehicle", eventually starting a company called Sinclair Vehicles Ltd in March 1983. He launched the
Sinclair C5 electric vehicle on 10 January 1985, but it was a commercial disaster, selling only 17,000 units and losing Sinclair £7,000,000. Sinclair Vehicles went into liquidation later the same year. The failure of the C5, combined with those of the QL and the
TV80, caused investors to lose confidence in Sinclair's judgement.
Amstrad acquisition of assets
Clive Sinclair sold the brand name to
's Amstrad in 1986
On 28 May 1985, Sinclair Research had announced it wanted to raise an extra £10m to £15m to restructure the organisation. Given the loss of confidence in the company, the money proved hard to find. In June 1985,
Robert Maxwell announced a takeover of Sinclair Research, through Hollis Brothers, a subsidiary of his
 However the deal was aborted in August 1985.
The future of Sinclair Research remained uncertain until 7 April 1986, when the company sold its entire computer product range, and the "Sinclair" brand name, to
Amstrad, for £5 million.
 The deal did not include the company itself, only its name and products.
Sinclair Research was reduced to being an
R&D business and a
holding company, with shareholdings in several new "spin-off" companies formed to exploit technologies developed by the main company. These included Anamartic Ltd. (
wafer-scale integration), Shaye Communications Ltd. (
CT2 mobile telephony) and Cambridge Computer Ltd. (
Z88 portable computer and
satellite TV receivers).
Return to invention
Inventors of the A-bike, Sir Clive Sinclair and Alexander Kalogroulis
Since 1986, the company has continued to exist, but in a completely different form. In 1993, 1994 and 1995 Sinclair made continuing losses on decreasing turnover. Investors became worried that Clive Sinclair himself was using his own personal wealth to fund his inventions. By 1990 the company's entire staff had been reduced to just Sinclair himself, a salesman/administrator, and an R&D employee. By 1997 only Sinclair himself was working at his company.
In 1992, the "
Zike" electric bicycle was released, Sinclair's second attempt at changing people's means of transport. It had a maximum speed of 10 mph (16 km/h), and was only available by mail order. Much like the
C5, the "Zike" was a commercial failure, and sold only 2,000 units.
In 2003, the Sinclair "ZA20 Wheelchair Drive Unit" was introduced, designed and manufactured in conjunction with Hong Kong's
Daka Designs, a partnership which also led to the
SeaDoo Sea Scooter underwater propulsion unit. In 1999 Sinclair released the world's smallest radio, in the form of the "Z1 Micro AM Radio".
12 July 2006 saw the release of the
folding bicycle invented by Sinclair, which was on sale for £200. It had been originally announced two years previously.
In November 2010, Sinclair Research announced the
X-1 electric vehicle,
 to go on sale in the UK in July 2011.
 However, as of July 2014 , the product has yet to be released.