I continue to learn new British vocabulary and/or slang on a regular basis. Here are some of the more interesting words I've discovered and continue to hear in everyday conversation or read in magazines.
Nick or pinch - to steal
Wheelie bin - the large garbage cans you roll to the curb
Trolley - shopping cart
Lippy - lipstick
Dodgy - risky or suspicious
Manky - scruffy, dirty or disgusting
Cheers - not just a toast, but rather a catch all phrase that also seems to convey thank you and goodbye
Squiffy - a little drunk; tipsy
This has been one of my favorite things about living in the UK, hearing the differences between American vs. British English. I especially like the last one... just sounds so appropriate.