The TV star died on Saturday, after a long illness, in Morocco, where she had a property, her publicist Benjamin Webb told the PA news agency.
She joined BBC Two programme Dragons’ Den in 2011 and left in 2012, going on to present Channel 4’s The Intern.
In 2013 she was made a CBE, honoured for a career in business and for her charitable work.
She founded the multimillion-pound freight distribution business Pall-Ex, after selling her home and car in the 1990s to finance it.
Her charity work included her position as vice president of the Carers Trust and she was also a patron of the Stroke Association, having herself suffered a stroke in 2009.
She also appeared in The Business Inspector on Channel 5.
Describing being made a CBE for services to the transport industry and to charity, she said at the time: ‘In every sense of the word, this is a great honour and I am equally flattered and flabbergasted.
‘It is wonderful to receive such recognition, but this should be less about me, and more about the charities that I support and the amazing transport sector in which I am privileged to work.
‘So I dedicate my honour to the Carers Trust, the Stroke Association, and Fresh Start – New Beginnings, and the other charities that I have tried to support, as well as to the lorry drivers, forklift truck drivers and everyone else who works in the logistics sector: the unsung heroes of British industry.’