G.F. Smith's permanent showroom, in Central London. Visits are by appointments only — But I would definitely recommend making the visit. All of their stocks are beautifully archived, along with example publications, and a rotating series of paper installations in both the window & basement, courtesy of Made Thought.
It has such a special vibe, it is very near Columbia Road and Broadway Market
It is surprising to find a farm in the middle of the city!
Very recommended having English Breakfast there :)