HungryHobo comments on The File Drawer Effect and Conformity Bias (Election Edition) - Less Wrong Discussion
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Yes, in the UK this is called the "Shy Tory" effect. I don't think all the media here is biased against the Conservative Party (some are pro, some are con) but you are quite right that the BBC (which is easily the largest and most powerful media organisation) is hostile. It's possible this is (part of) the cause of this effect, and it's notable that the three general elections where the polls messed up all did so by underestimating the Conservatives and overestimating Labour.
But I don't know that this is a case of the polls getting it wrong. If this was a case of the "Shy Tory" effect, why did the exit poll (and the unpublished Survation poll) get it right? By comparison, in 1992 the exit poll was wrong.
There may be another side of it: the tories do worse in cities better in the country.
BBC offices tend to be in cities so their staff are going to be surrounded by more lab/lib people meanwhile apart from debates where the audience is selected to match national statistics BBC studio audiences tend to be people who live in cities and are willing to stand in line for a long time for free tickets so are more likely to be young and poorer which makes them more likely to be lab/lib.