|This one and a female was actually spotted 50 km south of where we live. We've only seen it up here outside Ahus once before. It only seems to come near the coast here in tough winters.
In a Swedish report from 2010, I read that they overwinter in large numbers in coastal lagoons in Holland, Germany and Poland although numbers have declined. I'm sure you can find out more from Dutch Ornithologists, but keep your eyes open!