He worked on the Conservative Party's 1983 election campaign, standing in the new Hertsmere constituency after South Hertfordshire's abolition. As a result of his success on the campaign, Thatcher had intended to promote him to Foreign Secretary; however, before the election he warned her that this would be unwise, for his former secretary, Sara Keays, was pregnant with his child. Although Thatcher initially remonstrated with him that Anthony Eden's womanising had been no bar on his being Foreign Secretary, she instead appointed him Secretary of State for Trade and Industry.