Over the past decade, gluten-free has established itself as a significant category in markets in North America, western Europe and Australasia. Gluten-free specialists have become sizeable businesses, with some building notable international operations and some attracting takeover interest from larger rivals. In a series of articles, just-food's John Shepherd puts forward five markets seen as the next for gluten-free manufacturers  - and conventional businesss interested in gluten-free to target. First, we look at France, where gluten-free has taken longer to develop compared to some of the country's neighbours - and therefore one that could present opportunity.