British terms?

What do British people call the 7 foods in this picture:

http://oi67.tinypic.com/jzxogn.jpg

In America #1 and #2 are both called cookies. And if someone says they'll give you a cookie, you don't know whether they'll give you #1 or #2. Americans call #3 crackers, #4 a roll, #5 a hamburger with a bun, #6 a cinnamon roll or a cinnamon bun, and #7 are called biscuits.

The Oxford dictionaries says that British people use the term "biscuit" to refer to what Americans call a "cracker." Do they really call #3 crackers, or is the Oxford dictionaries just referring to #2? Americans wouldn't refer to #2 as crackers.

Do the British have a word for #7? In America they serve them at Kentucky Fried Chicken (KFC). I heard someone say British people call #7 rolls or buns, but then how would they distinguish them from #4 and #5? They're flakier than a roll, you don't put hamburgers on them, and they're not as sweet as scones.