Pitkin Soundguides appears to have been the record arm of book publishers H. A. & W. L. Pitkin. In 1977 they released an EP of highlights from the Queen's coronation, as a celebration of her jubilee year; it was numbered PSG-101. Distribution was by Lugton and by H. R. Taylor. The use of the plural, 'Soundguides', gives a hint that there ought to be some other records in the series, but I have never seen any listed.
Copyright 2006 Robert Lyons.