Founded in Sheffield in 1778, this company specialises in working alloys and metals that are difficult to shape. Its precision components include aircraft engines, turbine blades, casings and heat shields. Its owner, Dubai International Capital, halted plans to sell the business to a Chinese telecoms technology provider in April, reportedly because of security concerns. The Burton upon Trent firm is led by chief executive David Smoot, 47.

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Company details
Year2017
Rank98
CompanyDoncasters Group
ActivityEngineering components maker
LocationBurton upon Trent
Sales £m*654
Profit £m*101
Year endDec 16
Principal shareholdersDubai International Capital (98%), management (2%)
Staff4,207
Founded1778
Websitewww.doncasters.com

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* Supplied by company † Annualised figure