not backup UKIP doesnt mean there arent economist and business leader arguing either for exit from EU or renegotiation. i cant recall where i read it now, but surprisingly 50% over all the population across EU want their country to renegotiate, only a couple are strongly in favor of further...
and so end up with a situation where all three parties broadly agree to something and conspire to not allow the electorate any real say on the matter. i cant say i want referendums on every policy, but when it comes to a substantial matter, affecting the core of a country's politics and future...