He got off lightly, with a please to 'unwitting involvement', which few believe. So now he's living in Spain, like many a British criminal (he's barred from the US because of his criminal record, and divorced from his American wife, on whom he cheated a few times).
An article from this year - great for all lovers of schadenfreude (except the bastard is still filthy rich):
Mark Thatcher: Man on the runAfter his ignominious departure from Cape Town, typically protesting that his prosecution was politically inspired and that President Thabo Mbeki of South Africa had never liked his mother, Thatcher was adrift. He stayed with his mother at her house in Chester Square, Belgravia, before looking for a place to live. It was not easy. Monaco, famously described by Somerset Maugham as a “sunny place for shady people”, was his first choice, but he was told his temporary residency card would not be renewed. No explanation was given, but a spokesman for Prince Albert pointed out that the prince intended “morality, honesty and ethics” to be at the centre of life in the principality.
France and Switzerland also failed to extend a warm welcome, which is how Thatcher ended up on the Costa del Sol, renting Casa Flores. Lady Francis Russell, newly separated from her husband, moved in with him in May 2006. Both obtained divorces during 2007 and in March this year they married, quietly, in Gibraltar, in a ceremony attended by only three friends. Notably absent was Thatcher’s twin sister, Carol.
...
Thatcher’s future is uncertain. He recently applied for tax-residency status in Gibraltar, prompting speculation that he intended to make his home on the Rock, but his application is likely to have been turned down.
Adding to his problems, the owner of Casa Flores, a fellow Old Harrovian by the name of Stephen Humberstone, would very much like to evict him. Thatcher has an almost unique ability to rub people up the wrong way, which he has certainly done with Humberstone. “Basically, he just pisses me off. He is always late with the rent. Under Spanish law I have to wait three months before I can take him to court and he presumably knows that and pays up after two months. We were in the same house at school – I can’t believe he is treating me in such a shabby manner.
http://www.timesonline.co.uk/tol/news/politics/article4066733.ece There's a fascinating contrast between Mark and Carol Thatcher. Carol has basically always been a 'good egg' - a minor journalist, acknowledging that her mother's name helped get her known, but basically making her own way honestly in the world. She won a celebrity reality TV show, because people actually like her. Mark, on the other hand, has made millions in shady commissions from foreign companies in arms and other dubious areas, which involved the government his mother headed, financed a coup attempt, and cheated multiple times on his wife (I have no idea at all about Carol's love life - which is presumably a good indication it hasn't been awful).