EU referendum voting intention in the United Kingdom, by social class

The data displays the result of a survey asking respondents how they intend to vote in response to the question: should the UK exit the EU? The results are split here by social class. There is a distinct difference between two halves; in the top three social classes (A, B and C1), the majority of opinion is to remain a part of the European Union, however in the bottom three social classes (C2, D and E) the bulk wishes to exit.