Conman James McCormick, who is estimated to have made £50 million from selling fake bomb detectors, was jailed for 10 years at the Old Bailey today.
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Girls’ Schools Association president Sue Hincks is expected to address headteachers about key issues facing young people.
Manufacturing orders have been falling for months.
The 25 individuals, aged between 26 and 84, have a combined fortune of more than £110 million.