On 7 March 2004, Mann and 69 others were arrested in Zimbabwe when their
Boeing 727 was seized by security forces during a stop-off at
Harare's airport to be loaded with £100,000 worth of weapons and equipment. The men were charged with violating the country's immigration, firearms and security laws and later accused of engaging in an attempt to stage a coup d'état in
Equatorial Guinea. Mann and the others claimed that they were not on their way to Equatorial Guinea but were in fact flying to the
Democratic Republic of Congo to provide security for diamond mines. Mann and his colleagues were put on trial in
Zimbabwe, and, on 27 August, Mann was found guilty of attempting to buy arms for an alleged coup plot and sentenced to seven years’ imprisonment. Sixty-six of the others were acquitted. On 25 August 2004, Sir
Mark Thatcher, son of former
British Prime Minister Margaret Thatcher, was arrested at his home in
Cape Town, South Africa. He eventually pleaded guilty (under a plea bargain) to negligently supplying financial assistance for the plot. The 14 men in the mercenary advance guard that were caught in Equatorial Guinea were sentenced to jail for 34 years. Among the advance guard was
Nick du Toit who claimed that he had been introduced to Thatcher by Mann. Investigations later revealed in Mann's holdings' financial records that large transfers of money were made to du Toit, as well as approximately US$2 million coming in from an unknown and untraceable source. On 10 September, Mann was sentenced to seven years in jail. His compatriots received one-year sentences for violating immigration laws and their two pilots got 16 months. The group's
Boeing 727 was seized, as well as the US$180,000 that was found on board the plane.
Exposure A friend of Mann,
Nigel Morgan, who had ties to the
South African Secret Service, was alleged to have betrayed his knowledge of the plot to the South African authorities. The journalist Adam Roberts has argued that Morgan was in the unusual situation of being both a supporter of the coup and also an agent for the government, and that Mann knew Morgan was acting as an informant, but as a way of sounding out whether or not the South African government would care. Academic
R. W. Johnson, on the other hand, argued that only the 'shambolic state of the South African intelligence services' explains why an aborted 19 February attempt by Mann—which fell apart when a plane set to meet them in
Zambia suffered a
bird strike—was allowed to get off the ground in
Polokwane Airport. He emphasises that Morgan had personal and professional ties to Johann Smith, a
South African Special Forces veteran and security adviser to President
Teodoro Obiang Nguema, and most likely alerted President
Thabo Mbeki after the failed first attempt, who in turn tipped off the government of
Robert Mugabe. In a last-ditch effort on 30 January 2008, Mann tried to appeal the judgment to the Zimbabwean Supreme Court. The following day, Mann was deported to Equatorial Guinea in secret, leading to claims by his lawyers that the extradition was hastened to defeat the possibility of appeal to the Supreme Court. In Equatorial Guinea Mann was incarcerated in
Black Beach Prison, one of Africa's most notorious prisons and often viewed as synonymous with brutality.
Response by UK Parliamentarians Concern for Mann's plight was raised in the UK Parliament in the year of his arrest in Zimbabwe by three
Conservative Members of Parliament. During the two years after the government of Equatorial Guinea applied for his extradition, three further Conservative Party MPs submitted written questions. The sudden extradition drew the greatest response.
Julian Lewis said in Parliament: That position was supported by three other Conservative MPs during the debate. Written questions were submitted by a fourth. There was a request that the United States administration, which had access to Simon Mann in Black Beach Prison on 6 February 2008, exert its influence "to secure [his] safe return". UK officials were granted access to him on 12 February 2008. Labour and other parties expressed little concern about Mann or the others. The only non-Conservative Party MP to submit a question in Parliament about him was
Vince Cable, although an Early Day Motion about his treatment in prison received some cross-party support. On 8 March 2008,
Channel 4 in the UK won a legal battle to broadcast an interview with Mann in which he named British political figures, including Ministers, alleged to have given tacit approval to the coup plot. In testimony, he spoke frankly about the events leading to the botched attempt to topple Equatorial Guinea's president. On 7 July 2008, Mann was sentenced by an Equatoguinean court to more than 34 years in prison.
Release of emails and unpublished memoirs In 2024, Mann provided
The Daily Telegraph with access to emails and unpublished memoirs providing additional information. On the 20th anniversary of the coup attempt, the newspaper published an article on the coup. ==In popular media==