Penguins I know about, but it has been a long time. I know about McVities too, as I have an old friend who worked in their big plant in either Carlisle or Dumfries (she lives midway between those two cities). There is/was a McVities plant in the States some place but their product was a pale facsimile. I liked the digestive biscuit, particularly for dunking.
I'll keep looking.
Thanks a heap.
Bob