By no other means would her wayward son ever have become Sir Mark Thatcher.
The ex-SAS officer also alleged Sir Mark Thatcher was "part of the team".
The government of Equatorial Guinea is meanwhile seeking the extradition from South Africa of Sir Mark Thatcher, son of former UK Prime Minister Margaret Thatcher.
"Mark Thatcher provided financing for a coup d'etat in Equatorial Guinea and then he organised all the transport for the coup d'etat, " Mr Obono told the Associated Press.
Because the truth is there was a lot of national insecurity bound up in this, what with the alleged involvement in Al Yamamah of such luminaries as Mark Thatcher.
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This is how Mark Thatcher is now Sir Mark.
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Well-known hymns and poems will mark Baroness Thatcher's funeral on Wednesday, Downing Street says.
Lady Thatcher's children, Sir Mark and Carol Thatcher, said they appreciated the "great honour".
Only with hindsight did it become clear that the years immediately after the defeat of the miners and running-up to her third election victory in 1987 represented the high-water mark of the Thatcher era.
The SDLP MP Mark Durkan said Baroness Thatcher had made a "controversial impact" on political life and "divided opinion".
Baroness Thatcher's son Mark said his family have been "overwhelmed" by messages of condolence from the public after her death.
Former British Prime Minister Margaret Thatcher's son Mark was a notable entry in 1982, when he went missing for six days along with his co-driver and mechanic.
Denis Thatcher, father of Sir Mark, 59, and twin sister Carol, died in 2003.
Sir Mark, speaking to reporters outside Baroness Thatcher's former home in Belgravia, spoke of how "enormously proud and grateful we are that Her Majesty the Queen has agreed to attend the service next week in St Paul's".
The funeral was organized in line with the wishes of Thatcher herself and those of her twin children, Mark and Carol.
And he is not the only famous face at Number 10 on Thursday - former prime minister Baroness Thatcher will be paying a visit, for celebrations to mark her 85th birthday, along with 150 friends and colleagues.
Deputy prime minister Nick Clegg has described Baroness Thatcher as a "towering" figure who left an "indelible" mark on her country and the world.
Our hearts go out to Mark and Carol and their families, and also to those who cared for Lady Thatcher with such devotion in her last years.
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