Probe Into Wrong U.K. Opinion Polls Won’t Be Finished Until 2016

A voter exits a polling station with a dog after voting in the general election at Westover Free Church in Broadstairs, U.K., on Thursday, May 7, 2015. Britain votes on Thursday in the most uncertain election since World War II, a ballot that looks set to be followed by negotiations to secure a parliamentary majority and clashes over who has the legitimacy to govern. Photographer:Matthew Lloyd/Bloomberg

Photographer: Matthew Lloyd

An inquiry into the big mystery of the 2015 U.K. election -- why opinion polls failed to foresee Prime Minister David Cameron’s Conservatives winning a parliamentary majority -- isn’t due to be completed until early next year.

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