John Burton became Blair's election agent and one of his most trusted and longest-standing allies. Blair's election literature in the 1983 general election endorsed left-wing policies that Labour advocated in the early 1980s. He called for Britain to leave the EEC as early as the 1970s, though he had told his selection conference that he personally favoured continuing membership and voted "Yes" in the 1975 referendum on the subject. He opposed the Exchange Rate Mechanism (ERM) in 1986 but supported the ERM by 1989. He was a member of the Campaign for Nuclear Disarmament, despite never strongly being in favour of unilateral nuclear disarmament. Blair was helped on the campaign trail by soap opera actress Pat Phoenix, his father-in-law's girlfriend. At the age of thirty, he was elected as MP for Sedgefield in 1983; despite the party's landslide defeat at the general election.