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In 1987, Mark Thatcher married Diane Burgdorf, the conservative Lutheran daughter of a millionaire Texas car dealer. They reportedly met at a party for D Magazine, a Dallas lifestyle publication, while Thatcher was living in Texas as a representative of the luxury automotive company Lotus Cars. They have a son and a daughter, Michael Thatcher and Amanda Margaret Thatcher. The family moved to South Africa possibly to avoid bad publicity because of allegations of racketeering that resulted in a £4 million civil action in 1994.
On April 3, 2005, Sir Mark, then living with his widowed mother in London, announced that his family will reside in Europe after he was refused a residence visa to live in the United States, presumably as a result of his guilty plea in South Africa in re his alleged unwitting involvement in an attempted coup d'etat in Equatorial Guinea. His children, he stated, will be educated in the United States. In September 2005 his divorce was announced.
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Thatcher is alleged by Saudi dissident Mohammed Khilewi and British Member of Parliament Sir Tam Dalyell to have received a multimillion-pound commission on the £20 billion Al Yamamah arms contract with Saudi Arabia, which his mother signed in 1985 as Prime Minister. However, according to The Guardian, "Sir Mark has always denied receiving this payment or exploiting his mother's connections in business dealings."
Other widely reportedly Thatcher embarrassments include reported U.S. tax evasion (the criminal case was eventually dropped) and a racketeering case in Texas (it was settled out of court). According to "The Telegraph" (August 26, 2004), "In 1998, he was at the centre of a scandal after he lent huge sums of money at exorbitant interest rates to more than 900 local police officers and civil servants in Cape Town. He admitted lending the cash but insisted that he had done nothing wrong. He is also thought to have profited from contracts to supply aviation fuel in various African countries."
http://en.wikipedia.org/wiki/Mark_Thatcher