Picture posting is enabled for all :)
Sounds like it could be a 'cultivated' ie not wild blackberry as the berries are ripe to eat now. My new plot has a large patch which I have been picking, and advised by lottie neighbours that they are a cultivated variety - am tidying them up only, trying to eliminate the runners that sprung up all around the edges of the clump (delicious berries by the way, with apples in a pie (and icecream....yummy :)