Review of Pho

This chain says their entire menu is gluten free, except for the hoisin sauce on the tables. I've eaten at loads of these restaurants across London and this one once before and been fine but for some reason I had a really bad reaction yesterday after eating the summer rolls and pho. Not sure what went wrong? But I think perhaps they added celery, which I'm also intolerant to. So maybe it wasn't gluten after all.