Went for lunch. The whole chain is accredited by Coeliac UK, and they were focused and alert to what was needed.
Good selection of options for GF across the menu and no price premium. Staff were knowledgeable and apart from the pizza being less crisp (I would have suspected it might have been baked in a tray to avoid cross-contamination) everything else was as per the Pizza Express experience.
— Very
— Gluten-free items are marked on the main menu
— Most/All
— Excellent