Alan wrote:
I would imagine that Stanley Gibbons call on their retail and auction
business plus many other sources to produce the price values in their
catalogues. Is anyone aware how Scott obtains information to produce
their own catalogues?.
Gibbons deals in stamps; Scott doesn't.

For information about how Scott determines pricing, go to
http://www.scottonline.com/NewsandNotes/NN_howto.asp
and scroll down to "Catalogue values."

Bill