"From a Brexit point of view collaborative working projects such as science that Jim mentions was not a particular issue.
If the bodies that currently collaborate want to collaborate in the after Brexit future they will.
If all these different aspects of working together in whatever form just suddenly stop it means someone, somewhere has not done their job. "
That's cool and all, but it overlooks the impact that, in particular, loss of specific EU funding and loss of freedom of movement could bring (I say could, rather than will, because this was always couched in uncertainty). At any rate, the almost universal opinion of UK scientists was that EU membership was beneficial for Science, and while that is clearly at least partly self-serving it also counts as a positive case for remaining.
If you disagree with it, of course, then that's another matter.