This is what I don't understand: even if we left the EU tomorrow (and we will be in the EU for at least two and a bit years), unless the UK economy tanks, the EU workers in Boston are not going anywhere.
So, as you rightly say, what Boston needs is investment in things like housing, policing, schools, health-care and such like right now. But I fail to understand how our eventual departure from the EU will actually help with any of those things. This is failure of local and central government, which you/we all elect.
More mystifying is the fact that when investment in the town DOES arrive, e.g. additional housing developments like the Quadrant, my Facebook is full of people moaning about it!