It is not clear to me whether you are referring to Pret's sandwiches. I am not British, but when in London for work I tend to love Pret's. I found their offerin

It is not clear to me whether you are referring to Pret's sandwiches. I am not British, but when in London for work I tend to love Pret's. I found their offering healthier and tastier than basically any other fast food alternative in any other place in the world.