In the UK biscuits are what Americans call cookies - the article reads like it was written by a Brit. I don’t think there’s a UK equivalent to an American biscuit. They’re made with low-gluten flour and butter, and are like soft little cakes which break apart easily. They’re perfect when still warm, with butter and American jelly - which I think is called jam or preserves in the UK, but is differentiated from jam or preserves in the US because the solid bits have been strained out. British jelly is called aspic in the U.S.
Biscuits and jelly in the US is delightful, biscuits and jelly in the UK would be a fairly horrifying dish.
You can bake biscuits or cookies on your dashboard easily, but they need to be in a box with a glass lid which keeps the hot air in, rather than open to the air in the rest of the car.