Gluten-Free 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.
Cotto is a family run Italian restaurant and pizzeria on Westminster Bridge Road, opposite Lambeth North station. The site says it caters for vegetarian, celiac and other allergies with prior notice, and the card gives a gluten free price for most pizzas and pastas.