Alan published four editions of The Comic Book Price Guide For Great Britain, the first in 1975 and the last in the early 1980s, from memory (the third edition was two separate publications, one for Marvel and one for DC, so there are five in total). The idea obviously came from Overstreet, but Alan included lots of information (such as ND issues) and pricing that was relevant to the UK market. Much of the information, particularly on DC, was supplied by me. Most of the comics photographed inside were mine, too. I think Duncan McAlpine bought the rights from Alan, and went on to produce the much more professional editions from the late 1980s onwards. Unfortunately, Alan, who was one of the leading lights of UK fandom for many years, died about three years ago.