Margaret Thatcher tendency to override collegiate opinion, contributed to discontent within her party. Thatcher removed Geoffrey Howe as Foreign Secretary in July 1989 after he and Lawson had forced her to agree to a plan for Britain to join the European Exchange Rate Mechanism (ERM). Britain joined the ERM in October 1990. On 1 November 1990, Howe, by then the last remaining member of Thatcher's original 1979 cabinet, resigned from his position as Deputy Prime Minister, ostensibly over her open hostility to moves towards European Monetary Union. In his resignation speech on 13 November, Howe commented on Thatcher's openly dismissive attitude to
Diana Gould – Margaret Thatcher exchange toward it. The exchange between Thatcher and Gould became iconic, remembered because of Gould's persistence in asking why Thatcher had given the order, which seemed to rattle the prime minister. It was described as "the day Margaret Thatcher met her match". Thatcher was reportedly angry that the BBC had allowed the question to be asked. Her husband, Denis Thatcher, told the producer that the BBC was run by "a nest of long-haired Trots and wooftahs". Gould wrote a book about her experience, "On the Spot: The Sinking of the Belgrano" (1984). Diana Sydney Gould ("née" Prigg, 18 April 1926 –