Mart, ever been to or near Derry? Road schemes, infrastructure (such as the Foyle and Peace bridges), plus the airport (yeah, yeah) have all been partly or entirely funded by Europe.
If you think it's in the UK's interest to make NI, a place with less economic significance than Leeds, work, then your naivity is even worse than I thought. That's my last comment on the matter. Enjoy being f****d by Brexit. Perhaps your reasons for it extend beyond economic.