Howard,
The booklet was the special edition included with the March/April mailing of the NCR to all LDMCC members.
Apparently they have had these reprinted. According to the latest NCR editorial, copies can be obtained from Roy Shepherd, 4 St. Marks Cottages, St. Marks Road, Binfeild, Berkshire, RG42 4AU, Great Britain. Cost four pounds sterling posted to anywhere on the globe.
Primarily it is a photo compilation of period and contemporary photos, with just the essential history thrown in. If they are advertising in Old Bike Mart, then I assume sales are open to all.
-Doug