This has significant implications for the likely campaign ahead on Europe. The In side, much as it has been doing for years already, is naturally placed to predict doom-and-gloom and prey on people’s perceived ‘fear of the unknown’. The Out camp will be having to make the positive case for why leaving would be better, what grand vision they have that would see a more prosperous future for Britain. Anxiety at the prospect of change may lead to a preference for the status quo for some, but for women – who make up far more of the “Don’t know” floating voter category - propagating pessimism about the UK’s chances outside the EU may be the trigger which leads them to make up their minds.