"The civilian versions of assault weapons are even more dangerous than the military ones, because they are semi-automatic and so more accurate" (paraphrased from VPC or similar in the run-up to the end of the AWB).
"In America, you can just walk into a gun shop and come out with a machinegun" (seen several times on UK forums in discussions about firearm laws).
I mentioned it in another thread already, but my local newpaper was talking about a recent arsenal* seized in London, that included a "Beretta .9mm" (later refered to as a ".9" and a "9-cal"), and "Glock machine-pistols". (And a previous issue said that BB guns are "weapons of mass destruction" that can easily be converted to fire live ammo, "fueling a devestating trade in DIY death")
I'm surprised noone has mentioned that if you duck-tape a trauma plate to your back, you can provide hard cover for your partner.
*In this particular case, arsenal = several guns all siezed from different sources.