How votes have been churning between the parties since 2010
From the latest Ashcroft mega-poll We don’t often view polling data in this way partly because the sample sizes in the regular surveys are not really large enough to draw conclusions from sub-samples. Lord Ashcroft gets round this by using very large samples with the result that for poll watchers like me his detailed data can provide good insights and pointers. Clearly the top two, UKIP and LAB, have seen the most new support coming to them and are probably…