Does anyone know the name of this certain "Jacob's" biscuit? (UK)

I tasted a biscuit out of a box that was given to me by a friend over the holidays. It was an assortment of “Jacob’s” biscuits. Apparently the box was misprinted because the biscuit that I really liked was NOT the one in the written description. I have no idea what the name of this certain biscuit is. Can you help?

The biscuit is rectangular and is dark brown, grainy and sweet…almost like a digestive but not quite.

Any ideas? Thanks so much!