• ComRes phone survey contrasts with tight race in online polls
  • Cameron to travel to Brussels Thursday for EU negotiations

British voters back remaining in the European Union by a margin of 21 points, according to a telephone poll by ComRes for Open Europe published on Wednesday.

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The poll is in contrast to two other surveys in the past week which put the sides in the EU membership referendum that Prime Minister David Cameron has promised neck-and-neck. ComRes said the difference is a result of polling by telephone, rather than online.

ComRes found 56 percent of respondents saying they would vote to stay in the EU, while 35 percent said they would vote to leave. The poll of 1,001 adults was conducted from Dec. 11 to Dec. 13. No margin of error was given.

The figures are “remarkably consistent” with similar ComRes surveys in September and May, ComRes said in a statement on its website. It noted that Ipsos Mori, the only other pollster regularly conducting phone polls, was also showing “consistent double-digit leads” for staying in the bloc, while most online polls are showing the race much closer.

Cameron will travel to Brussels on Thursday to press his case for renegotiating Britain’s membership of the 28-nation EU ahead of the referendum, which he has promised to hold by the end of 2017.

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