I'm an American, and though we share many idioms, I would say this list is British dominant.
Looking over the idioms, I recognize many of them besides 'knickers in a twist,' 'a spanner in the works,' 'yob,' 'swizz.' Some are similar, but slighty different (apparently British use 'rabbit in the headlights' while Americans use 'deer in the headlights').
A few idioms from this list I think are important: Don't get me wrong!, no-win situation, keep me posted, not give me the time of day, let the cat out of the bag, to jump the gun, head over heels, get your hands dirty and blow your own trumpet (Americans often say 'toot your own horn' instead).
Here's a good site for American idioms, if that's what you're looking for:
Feel free to ask me if you have any questions about a particular idiom :)