The An Pho chain in the UK, known as Pho Restaurants, holds accreditation from Coeliac UK. It offers a separate gluten-free menu, and items on it are clearly marked with GF symbols. In the kitchen, separate utensils, equipment, and a dedicated fryer are used for gluten-free dishes. Staff receive training on allergen queries. The page includes a disclaimer stating that 100% freedom from cross-contamination cannot be guaranteed. Because of that disclaimer, the chain does not reach an A+ rating.
Honest caveat, The venue's own allergen page states they cannot guarantee any dish is 100% free from allergens despite taking care to avoid cross-contamination.