Vegan and Vegetarian are on the menu, but the same kitchen also prepares what you avoid, so cross-contamination is possible. Tell staff what you react to, and ask how your dish is prepared before you order.
Indigo is the restaurant of the One Aldwych hotel in Covent Garden. The hotel says every dish at lunch and dinner is entirely gluten and dairy free, built on British produce by Executive Chef Edward Dutton. Breakfast is served too, with gluten free dishes marked individually.