I have to ask, as a Colonial...what the heck is a "digestive biscuit"?
"what the heck is a "digestive biscuit"?"
It's some kind of cracker imposter, basically coursely ground grain, chaffe and straw included, pounded into a thin wafer.
According to "A Nice Cup of Tea and a Sit Down," a digestive biscuit has "two main varieties, sweetmeal and wholemeal. The Digestive sets a standard for the whole biscuit world." It's really a heartier version of the Graham cracker and can be bought in a chocolate covered form. They're good!