Havtorn is the Danish name for this plant. According to my research, the English is Seaberry or Sea Buckthorn. It's a coastal plant with very vicious thorns that is abundant in the dunes between my home and the sea to the East. It's really only 500 meters walk or so out there into the dunes.
The berries are edible and are most popular in Danish culture added to a type of seasoned schnapps (kryddersnaps). However, my quick research when making this post reveals that they are very high in Vitamin C and also have some properties for herbal medicin.
The next picture is a less cropped (higher pixel count) version of the first. All pictures are clickable to display them in higher quality.
1/80 sec. f 4. ISO 640. Aperture priority mode. It wasn't a bright day, so needed high ISO to get hand-holdable shutter speed.
This one shows a bit more of the bush, as opposed to my obsessive close-ups.
1/50 sec. f4. ISO 400. Still Aperture priority.
Unfortunately I didn't have the sense to take a picture of a larger clump of them. Generally the grow in the sheltered valleys between the dunes and will grow in huge, dense clumps, making the area pretty much impassable because of the size and sharpness of their thorns.
When the berries first appear, they are far denser. But this is later season so they've been picked down well, probably by both humans (there is a summer house colony between us and the sea) and wildlife.