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Please does anyone know of a blackcurrant that comes off the stalk like a raspberry does.

If you mean a blackberry that has fruit that comes away cleanly from the white hull inside, leaving the hull on the plant like raspberries do, I don't know of one.
I've always been led to believe that this in fact was one major difference between the two fruits - raspberries come away cleanly from the hull, blackberries don't.
I understand that there is a black raspberry you can get, but assume this tastes like a raspberry not a blackberry.
Out of interest, why are you asking about this? Is the hull on your blackberries a problem to you?

Not for me Jenny. The site manager was asking so I said i would ask the experts.

Loganberries come away leaving the white hull Jan