• Former PM's son 'should face justice', says Mann• Scotland Yard confirms it will interview ex-officerThe British mercenary Simon Mann today vowed to testify in court against Sir Mark Thatcher and the oil tycoon Eli Calil, the two men he alleges were co-conspirators in the failed attempt to take over Equatorial Guinea in 2004.Speaking as he flew back to Britain from the west African state, Mann made clear he had no intention of drawing a line under the episode, and would welcome a fresh inquiry that could lead to him giving evidence against his two old friends.Mann warned Thatcher and Calil, who deny any involvement in the plot, that he will repeat in a British court the allegations he has ...