Clump-forming shrub associated with hedgerows.
No interactions present.
It does not look as though the styles are united into a column, so it is more likely Rosa canina, but the photo is not clear enough to be sure.
Lat/Lng: 50.25613, -4.88269
OS grid ref: SW946435
Historic village in dairy farmland with some arable fields. Cornish field-patterns and lanes with well-established hedgerows.