"In 2015, the Conservatives, UKIP and the Greens promised a referendum in their manifestos. The Conservatives won a majority in Parliament, and in terms of the popular vote, Tories + UKIP + Greens = 36.1% + 12.6% + 3.6% = 52.3% of the vote on a turnout of 66.4%."
Let's for a brief moment consider the opening sentence. The implicit assumption here is that everyone that voted in that election voted with Europe in mind. This is incorrect, UKIP voters maybe, but it shouldn't be generalised any further than them, should it? Additionally, it doesn't follow necessarily that a vote for a particular party means one wants to see the whole manifesto enacted, one gives one's assent to the manifesto, but there may well be, subjectively, unpalatable aspects to it.
Thirdly, don't you think it's funny dragging in the Greens arbitrarily to get the numbers over 50pc to endorse a Tory attempt to deregulate and lower environmental/food standards?