Mary Archer evidence at the High Court in a libel case brought by her husband against the "Daily Star" newspaper, which claimed Jeffrey had slept with a prostitute called Monica Coghlan. During his summing up at the end of the trial, the judge, Mr Justice Caulfield, asked: "Has she elegance? Has she fragrance? Would she have, without the strain of this trial, radiance?" In 2001, when Jeffrey Archer was accused of having committed perjury in the 1987 trial, she appeared at the Old Bailey to defend him. Jeffrey Archer was subsequently convicted and imprisoned for perjury and perverting the course of justice.
Jeffrey Archer down as an MP at the October 1974 general election. While he was a witness in the Aquablast case in Toronto in 1975, Archer was accused of stealing three suits from a department store. Archer denied the accusation for many years, but in the late 1990s he finally acknowledged that he had taken the suits, although he claimed that at the time he had not realised he had left the shop. No charges were ever brought. Archer wrote his first book, "Not a Penny More, Not a Penny Less", in the autumn of 1974, as a means of avoiding bankruptcy.