I think British English (proper, not cockney) sounds really nice and I quite dig the accent. But more than the sound and accent, I really like some of the words. A smattering for your consideration:
+ Bodge: to (less than carefully) fix something, as in, “My dad bodged up the toaster with a bit of foil and some gum.
+ Arse: often used instead of butt, but it can also be used like this: “I can't be arsed to get out of my chair and find the remote so I'm watching golf on TV.” Which of course, means that that person can't be bothered. Great phrase.
+ Bollox: This is sort of like a substitute for crap. As in, “That's bollox!” or “He's talking a load of bollox.”
+ Load: a bunch of … whatever
+ Bung: to throw, as in, “Bung me that book, will ya?”
+ Mate: a friend
+ Rate: to fancy (like) someone, as in, “I really rate your cute older brother.”
+ Dodgy: means “sketchy”, as in “I wouldn't walk down that street late at night. It's a bit dodgy.”
+ Fit: good looking, as in, “Brad Pitt is quite fit.”
+ Kip: a nap
+ Porkies: Lies … this is one of the weird Cockney rhyming words. Porkies is actually short for “pork pies” which rhymes with lies. Get it? Me neither. Anyhoo, the Brits have loads of these words. I think it's a rather confusing custom.
+ sack: to fire someone, as in, “I was sacked for making copies of my arse.”
+ snog: to make out
+ spend a penny: to go to the bathroom
+ starkers: to be stark naked
+ ta: thanks!
+ sad: pathetic
+ poof: gay man, as in “Queer-Eye is about five poofs …”
+ jumper: sweater
Here's a nice British-American English dictionary. Funny.