Welcome Yoda !
It's Anthomyia but not pluvialis. See this previous thread.
Much closer to procellaris to me, but I don't know the others species and they are not easy to separate as I know.
Thanks! I read that thread today and agree that it doesn't seem to be pluvialis. Since pluvialis and procellaris by far are the most common in Denmark I think you are right. I haven't been able to find any photos of procellaris though and i'm not sure how they look exactly.