since everyone else on this board probably have lives and don't sit up at 2 in the morning, I'm going to answer your "dumb question" (it isn't dumb, always know the facts first)--
england recently depenalized pot possession for personal use. If you're caught, and it's a small amount (less than an ounce, I believe), your stash will be confiscated and you'll be given a "caution" by the police. You can be arrested for possession if it's "aggravated possession"--smoking in public, near a school, after fighting with the police officer--the maximum jail sentence for that is 2 years. But cannabis has been reclassified, so in most cases you won't be arrested, only given the caution and told to go on your way.
moving to england, you're close to a lot of countries with liberal cannabis laws. aside from the netherlands (practically legal) there's switzerland, where coffeeshops do exist, germany, where they're about to legalize possession in Berlin and everywhere else it's a small fine, spain, where cannabis possession isn't an offence, belgium, where it's also practically legal, and italy where (still) possession of less than 3 grams is a minor infraction. france is still tough but, interestingly enough, lots of the possession cases don't even make it to court (though they haven't spared our friend nol--after a 15 YEAR OLD CHARGE!!). in the czech republic, "small amounts" aren't an offense, though they don't specify what "small amount" really is.
of course i envy you, you're leaving the usa. Here they do everything to make you feel like you're no better than snake scum for having tried pot. I can assure you that, even in stodgy britain, the overall impressions had by people about pot are probably friendlier than anything you could encounter in "drug-free" USA, a country that does its best to demonize and demonize our pasttime...
...enjoy britain, mate. I hope you drink, that's a customary must for most britons, I've found. and soccer.
"A pipe of kif gives a man the strength of a hundred camels in the courtyard" --Paul Bowles, 1960