New North Press
We've recently been doing some work with the lovely folk over at New North Press, a letterpress studio over near Old Street, run by Graham Bignell, who set it up in 1986. They have stacks of woodblock and metal type, and specialise in artists' books, portfolios and print editions; as well as producing a rather fine series of posters, as we've mentioned before. Well worth a look.
Alistair's posted a full set of pictures on Flickr.