I thought this list of UK names/equivalents/substitutions to US products might be useful to someone else, as they sure have been for me. It's frustrating trying to cook for yourself to get that "taste of home", and not being able to find what you need! I've added notes here and there to hopefully make it easier to find the right thing... I can't promise substitutions will be perfect, but at least you get a jumping-off point, eh?
All-purpose flour = plain flour
Bread flour = strong flour/hard flour/bread flour
Self-rising flour = self-raising flour
Cake/pastry flour = soft flour
Whole wheat flour = wholemeal flour
Corn flour = extra fine cornmeal/maize flour
Cornstarch = corn flour
Powdered sugar/confectioner's sugar = icing sugar
Granulated sugar = caster sugar
Baking soda = bicarbonate of soda (often found in a plastic or cardboard jar, rather than box)
Corn syrup = golden syrup
Molasses = treacle
Shortening (Crisco) = vegetable fat spread (brand names include Cookeen, Stork)
Non-dairy whipped topping (Cool Whip) = long-life UHT cream/whipped cream substitute
Half and half = single cream
Whipping/heavy cream = double cream/whipping cream
2% milk = semi-skimmed milk
Pumpkin pie spice = mixed spice (contains coriander, rather than nutmeg)
Cilantro = coriander leaves
Bacon = smoked streaky bacon rashers
Ground beef/pork/etc. = fine mince beef/pork/etc.
Beef/pork/etc. tenderloin = beef/pork/etc. fillet
Tomato paste = tomato puree (will often come in a metal tube inside a cardboard box, like toothpaste)
Green onions = spring onions
Green beans/string beans = spring beans
Great Northern beans = cannellini beans
Zucchini = courgette
Snow peas = mangetout
Fava beans = broad beans
Eggplant = aubergine
Garbanzo beans = chickpeas
Instant pudding mix = whipped dessert mix (Angel Delight brand is very close)