In November 2012, according to The Guardian's website survey, 56% of Britons would vote to leave the EU in a referendum.

Part of this research involves conducting in-person surveys in several countries and gathering health information through a website survey.

But you don't need much theory to notice that a self-selected website survey acknowledged in the survey report itself to have sample problems - the main one being that those seeking out the website were probably looking for information on the subject being surveyed - should not be regarded as having general validity.

Although your browser settings don't allow you to view the website survey we're conducting, please e-mail your comments.