Eighth Report of The Postmaster General on the Post Office, London, 1862, 74 p.; report dated 9 Apr. 1862.
http://books.google.com/books?id=70gMAQAAMAAJ

(p. 18)  A note on postage stamps, suggesting either that the Post Office maintained something like  a stamp collection, or was aware of the newly published stamp catalogues.  http://books.google.com/books?id=70gMAQAAMAAJ