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
Margaret Thatcher the party. During her premiership Thatcher had the second-lowest average approval rating (40%) of any post-war Prime Minister. Since the resignation of Nigel Lawson as Chancellor in October 1989, polls consistently showed that she was less popular than her party. A self-described conviction politician, Thatcher always insisted that she did not care about her poll ratings and pointed instead to her unbeaten election record. Opinion polls in September 1990 reported that Labour had established a 14% lead over the Conservatives, and by November the Conservatives had been trailing Labour for 18 months. These ratings, together with Thatcher's combative personality and