Without wishing to derail the derailing that is already going on......
Isn't it inevitable that UKIP will start to disintegrate? They are, primarily, a single-issue pressure group, and once we actually leave the EU their whole reason for existance will have evaporated. They can use the time between now and then to try to re-invent themselves as a genuine political party but will , I believe, struggle and eventually fall apart. UKIP was established to pressure for a referendum on leaving the EU - as a single issue this will have attracted people of all political stripes, all wanting to say goodbye to Europe. It will be much more difficult, impossible maybe, to align all these people when they start talking about housing benefits, the NHS, defence spending etc etc. I can see people returning to their more traditional voting patterns and UKIP going the way of the SDP.