seat was won by the Ulster Unionist Party (UUP). In a by-election in 1969, the seat was won by Bernadette Devlin standing as an independent socialist nationalist on the "Unity" ticket, which sought to unite nationalist voters behind a single candidate. At the age of 21, Devlin was the youngest person ever elected to the House of Commons in the era of universal suffrage. The by-election saw a 91.5% turnout, a record for any UK by-election. Devlin held her seat in the 1970 general election but generated controversy when she had a child while still unmarried as well as for her fierce anti-clericalism. The Social Democratic and Labour Party (SDLP) stood a candidate against her in the February 1974 general election and the nationalist vote was strongly divided, allowing John Dunlop of the Vanguard Progressive Unionist Party to win with the support of the UUP and the Democratic Unionist Party (DUP). Dunlop held his seat for the next nine years, though in 1975 he was part of a large section of Vanguard that broke away to form the short-lived United Ulster Unionist Party. He held his seat in 1979 only owing to a unionist pact. He polled poorly in the 1982 Assembly election, taking 2.8% of the vote. Consequently, he did not stand again in 1983, and the following year the UUUP was wound up. The 1983 general election saw a fierce contest for the seat, with the UUP, DUP, SDLP and Sinn Féin all polling strongly. The winner was the DUP's William McCrea, by a narrow majority of just 78 over Sinn Féin's Danny Morrison. In general elections from then to 2005 the UUP did not contest the seat. Following the boundary changes, McCrea contested the new Mid Ulster in 1997 but, by then, Sinn Féin had established itself as the most likely party to outpoll a unionist and so drew votes from the SDLP, resulting in Martin McGuinness winning. He held the seat at the general elections of 2001, 2005 and 2010. During the 2001 general election, Mid Ulster had the highest turnout in any constituency in the United Kingdom. On 11 June 2012, McGuinness announced his intention to resign from the House of Commons to concentrate on his position as Deputy First Minister and avoid so-called 'double jobbing' by which members of the Northern Ireland Assembly also work as councillors or MPs. This necessitated a by-election. On