FILE - Britain's Prime Minister Theresa May speaks to the media outside her official residence of 10 Downing Street in London, Tuesday April 18, 2017. Theresa May, who succeeded David Cameron after he resigned following Britain's vote to leave the European Union in a referendum in June 2016, sought to capitalize on the Conservative Party's big opinion poll lead and called an early general election for June 2017. (AP Photo/Alastair Grant, File)
FILE - Britain's Deputy Prime Minister John Prescott arrives at 10 Downing Street for a Cabinet meeting in London, Monday, May 7, 2001. Prescott punched a man with a mullet hairdo after he had thrown an egg at him on the campaign trail. (AP Photo/Alastair Grant, File)
FILE - British politician Michael Foot looks on, in March 1983. Former Prime Minister Margaret Thatcher's victory in the 1983 election became more or less assured after Labour, which had been riven with divisions over the previous few years, published an election manifesto that one moderate member of the party described as “the longest suicide note in history.” (AP Photo/John Redman, File)
FILE - In this Wednesday, Oct. 10, 2007 file photo British Prime Minister Gordon Brown leaves 10 Downing Street for parliament. Blair's successor Gordon Brown didn't have his predecessor's natural communications skills and that was particularly evident in the election campaign of 2010. Brown's ratings — and Labour's — had collapsed in the wake of the global financial crisis and the party, in power since 1997, faced losing to the Conservatives. (AP Photo/Sang Tan, File)
FILE - British Conservative leader Edward Heath addresses a young audience at a "Talk In" at the Open Space Theatre in London, England on Sept. 29, 1974. Conservative Prime Minister Ted Heath called a general election a year earlier than necessary for February 1974. On explaining his decision to hold the election in the midst of a winter when power was being rationed, Heath said that he sought a mandate from the British people to rein in the power of trade unions. (AP Photo/Robert Dear, File)
FILE - British politician Neil Kinnock speaks at a Labour Party Conference in this undated photo. A rally was held in Sheffield, a city in the north of England, and optimism was high. It was an event unlike anything seen before in the U.K. — more like an event seen in U.S. presidential elections. Kinnock was clearly caught up with the buoyant mood and started shouting a phrase that sounded like “We're alright!” or “Well alright” several times. (AP Photo/Peter Kemp, File)