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.
"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.
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.