I think I found they're website but I'm not entirly sure. On the site I found they didn't sell anything like the shortbread. But on the front it says:
"Old Blacksmiths Shop
Purity
pure butter
Shortbread
Petticoat Tails
Guaranteed
Gretna Green"
That is what it says going from the top and moving my way to the bottom of the cover.
Chris