Is Turkish delight suitable for vegetarians?
Traditional Turkish delight is set with starch, not gelatine, so generally yes. Check the individual product page, as some filled or coated versions differ.
Does it contain nuts?
Several varieties do, and the range is made in a facility handling nuts. Read the allergen statement if you have an allergy.
Why is it dusted in powder?
Icing sugar or cornflour stops the pieces sticking together. It is part of the sweet rather than a coating to brush off.
How should it be stored?
Cool and dry with the lid on. Refrigeration makes it firm and slightly rubbery, so the cupboard is better.