"At least they have their feet on the ground to the general principle of being in an economic union,..."
A little digressive I know, DT, but the EU is not an "economic union" as you suggest. It is a collection of widely disparate sovereign nations each with its own priorities and requirements. Were it an economic union (particuallry those nations that use the Euro) it may function a little more satisfactorily. But it isn't. Each nation has its own economy and they vary considerably. Most of the problems the EU throws up are a result of its politicians behaving as if it is an economic union and trying to force "one size fits all" solutions without economic and fiscal unity. It's no use blaming the "global financial crisis" or anything else. These problems were forecast by many people throughout the EU's evolution. and are a direct result of the malfunctioning of an organisation which is flawed anyway.
Back to the question, the Labour Party has absolutely no intention of even threatening that the UK, under their governance, would leave the EU, whatever that wretched organisation throws at us. They have no plans for any meaningful renegotiation of the UK's relationship within the EU. In short they are perfectly happy with things as they are and the status quo is in no way beneficial to the "working man". For what it's worth the Tories talk a good talk on this issue but they too have no realistic prospect of any meaningful changes being achieved (whether they really want any or not) and so under both those parties the "working man" is well and truly stuffed.