This is obviously not the Rosa kamchatica described by Ventenat in 1800-1803.

Journal of Ecology 2005. 93, 441–470
BIOLOGICAL FLORA OF THE BRITISH ISLES* No. 239
List Br. Vasc. Pl. (1958) no. 225, 5
Rosa rugosa Thunb. ex Murray
HANS HENRIK BRUUN

No subspecies of R. rugosa have been recognized in the British Isles. Despite the many cultivated varieties of the species, mainly forms close to the wild type are seen naturalized. However, naturalized clones may be confused with R. x hollandica (syn. R. x kamtchatica). This taxon differs morphologically from R. rugosa by having soft-textured, dull leaflets, without prominent veins, less prickly stems, conspicuously glandular sepals, and smaller flowers and hips (Rutherford 1990).