It was a (sort-of) documentary, partly by Iain Sinclair, about the bookfinder Drif Field, author of the fantastic "Drif's Guide to the secondhand bookshops of the British Isles".
Drif seems to have vanished, which is a great shame as there aren't any other guidebooks with entries arranged by ease of access by railway (including the Not Work Sour Feast), and typically reading "Med R/C stk, Bookfairy, NSOC, FARTS", all of which then turn out to be entirely correct observations, though not what you might think.
first shown in Channel 4's Without Walls series in 1992
BFI | Film & TV Database | The CARDINAL AND THE CORPSE (1992)