Answers: British English to American English:

• Bangers - sausages
• Biscuit - cookie
• Bonnet - hood of a car
• Boot - trunk of a car
• Braces - suspenders
• Chips - french fries
• Crisps - potato chips
• Full stop - period (as in the period at the end of a sentence)
• Loo - toilet (Note: People from the U.S. run into problems around the world because we confuse people by using terms like "restroom" and "bathroom".  In other cultures, this confuses people because they think you want a room with a bathtub!  Toilet is the term that works best around the world.  The British will also use "the gents" or "the ladies" to refer to a public bathroom.  An old fashioned term you might come across is "water closet.")
• Nappy - diaper
• Public school - private school
• Randy - horny (So if you usually go by "Randy", you might drop that in Great Britain!)
• Rucksack - backpack
• Scone - biscuit (albeit bigger than ones in the U.S.)
• Second floor - third floor!  Europeans count the ground floor as "zero", so their first floor is our 2nd floor, their 2nd floor is our third, etc.
• Serviette - napkin
• Takeaway - takeout (food)
• Torch - flashlight

How'd you do?  There are enough differences in British and American English that you can actually buy dictionaries for the two languages!!