Sunningdale
West emerged as a fierce critic of the negotiations that would lead to the Sunningdale Agreement, and led the "anti-White Paper" Unionists in the Northern Ireland Assembly, 1973. When in January 1974 the Ulster Unionist Council voted against Faulkner's course of action the latter was forced into resignation. West succeeded him as leader of the party and sought to regain much of the support that the party had lost to breakaway and other Unionist groupings. In the February 1974 general election West negotiated the United Ulster Unionist Coalition with the Vanguard Progressive Unionist Party, led by Craig, and the Democratic Unionist Party, led by Ian Paisley, which would put up a single anti-Sunningdale Unionist candidate in all twelve constituencies on a platform of abolishing the power-sharing executive. West himself stood in Fermanagh and South Tyrone and won, albeit due to a split nationalist vote.
The UUUC campaigned fiercely for the abolition of the executive, which came about in May 1974 following a general strike. West continued to seek ways to expand unionism and recruited the ex-Conservative Member of Parliament Enoch Powell to the party. Powell stood for and won the South Down constituency in the October 1974 general election, but his opposition to the restoration of Stormont and preference for greater integration with the United Kingdom was to cause ruptures within the party. West himself lost his seat in Parliament due to a pact between Nationalists, so having the dubious distinction of being the only MP who served between the two general elections in 1974 who never served in any other Parliament, but he remained leader of the party. The UUUC lasted another few years and won the overwhelming majority of the seats in the 1975 Northern Ireland Constitutional Convention which sought to gain consensus on the future of the province. When the Vanguard Party fell apart over proposals for a voluntary coalition with the Social Democratic and Labour Party, West negoiated with Craig for the majority faction to merge into the Ulster Unionists.
The 1979 general election was relatively disappointing for the Ulster Unionists, as they won only five of the province's twelve constituencies. In June 1979 West stood as one of two candidates in the first elections to the European Parliament. However he was unsuccessful in the Single Transferable Vote constituency for the entire province and had the personal humiliations of seeing rival DUP leader Ian Paisley top the poll, fellow Ulster Unionist John Taylor win one of the seats and former Ulster Unionist member James Kilfedder performing better than West to become runner up. West resigned shortly afterwards.
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