Being a severe coeliac is completely different from being gluten sensitive or cutting it out for other health reasons. I just wanted to point that out for anyone new to the idea of gluten free. If you have coeliac disease, actual damage is caused to the lining of the intestine if you ingest gluten. Some coeliacs are far more sensitive than others and may have to watch *everything* (such as medicine, glue, and cosmetics).
If you are gluten sensitive or allergic, again, there are different levels of sensitivity but you won't do actual damage to your intestines. Though, of course, if you are severely allergic that's something else entirely!
Cross contamination is a huge problem for coeliacs and also people with allergies. My son is currently on a diet free of dairy, eggs, soy, oats, rye, tree nuts, potatoes, tomatoes and chicken. Even at the best health food stores, we find cross contamination a HUGE problem.