Yes, all-purpose is just plain white flour.
Baking soda-bicarbonate of soda, at least that's what the box in my pantry says
Shortening is the solid vegetable oil. Has the same consistancy as lard but creates a firmer finished product that doesn't flake or fall apart. If you can't find something like it, margarine is the best substitute as margarine is simply solid vegetable oils that are flavored to taste butter-like. Butter can be used to but it tends to spread a whole lot in baking and makes a very crunchy texture.
At least in the US, cinnamon toast crunch is a very sugary breakfast cereal, and cinnamon grahams are crackers...I think our crackers are the same as your biscuits? Anyway, the crunch and grahams have never been the same thing as far as I know.
Grahams are called that because they are cracker/cookies/biscuits made with graham flour.
I realize most of those questions have already been answered, but I love everything related to cooking and kitchen so I just had to throw in my two cents! (pence? I'm so out of it, but I just love this board)