I am going to try that recipe since I seem to be on a quick-bread obsession at the moment. However, I can not see it keeping for unlimited amounts of time as would be appropriate for a GHB.
Mine goes into the back of the vehicle and is forgotten for months at a time and I am certain the oatcakes would be crumbled and moldy by the time I dug them out in an emergency, since I have few of those that require use of the GHB.
I keep a can of B&M bread.
https://www.amazon.com/Brown-Bread-Raisi...B001EO5Y8E
Not only does it supply bread with extended shelf life but once open you also have a useful container for boiling or cooking.
It is on the shelf at your local Kroger, usually at the end of the baking section.