<<Disclaimer: Verify this information before applying it to your situation.>> Having just returned from the US and Canada with Bette Hagman's books and a suitcase half full of potato starch, tapioca flour, bean flour, cornstarch, xanthum gum and measuring cups - all of which are difficult to obtain in the UK - I have a few questions. I hope that someone may be able to help - so here goes: 1. Mustard powder - in the UK wheat is used as a filler and is noted on the ingredients. Is this so in the US - I looked at the mustard powder in the grocery and health food stores but it did not list wheat. Would it be safer to order this by mail from a gf store? If so can anybody recommend one? 2. Cornstarch - is this the same as cornflour (in the UK) which looks identical and is used for thickening? 3. Does a "stick of butter" weigh 2 ounces? Can't wait to get started on all those wonderful recipies - so thanks in advance. Chris