Sir James Dyson, 67, plans to spend £250m to double the size of his Wiltshire research base and hire 3,000 extra engineers by 2015. Best known for its bagless vacuum cleaner, Dyson attributed a 17% rise in turnover in 2012 to £1.2bn to its investment in research.

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Company details
Year2014
Rank36
CompanyDyson
ActivityAppliance manufacturer
LocationWiltshire
Sales £m*1,240
Profit £m*364
Year endDec 12
Principal shareholdersSir James Dyson and family (100%)
Staff4,500
Founded1993
Websitewww.dyson.com

If applicable:

* Supplied by company † Annualised figure