Also,
bisquits==cookies
bang==to have intercourse with
fag==homosexual, not cigarette
rubbers==condoms, not wellies or overshoes
trainers==tennies, tennis shoes or running shoes, although trainers is becoming more common in US
pudding==usually blancmange, often flavored choc, etc.
dessert==not always pud---and pudding is not always dessert
bobbie--also cop, not necessarily derogatory. Pig is.
WC/loo==bathroom, toilet, necessary, powder room, ladies, gents, etc.

If you are hiring a car (renting, over here) get a GOOD color coded map and be sure you understand the differences between kinds of roads. Stay away from "secondary" roads......ooo, so much. See Bill Sables.