Online opinion polls in the run-up to May 5 elections across Britain overstated support for the U.K. Independence Party, suggesting they may also be overestimating backing for leaving the European Union, according to a polling analyst.
For months, pollsters have been aware of the difference in outcome between online and telephone polling on the question of EU membership. With the referendum on a so-called Brexit coming on June 23, online polls put the two sides neck-and-neck, while telephone polls have the “Remain” side in the lead.
