I found a gluten free soup at Pret-a-manger, an organic food chain. I’ve known it while I was in London a few months ago and I found it as a good way to have a quick and healthy fast-food. In every store the staff has a allergenic list to check which is the gluten free food you can have.
Have a look to my travel post related to this place>>
Vai al mio diario di viaggio legato a questo posto>>