I love reading other blogs, as well as my one;) and I found this over at Old Bike Blog.
Seems the British are scanning are in vintage catalogs of parts and bicycle catalogs. All are in Adobe Acrobat PDF format, that if you don’t have, it is free and you can download here. most new PCs come with it.
Constrictor logo from catalog
The catalogs are here, at the National Cycle Library, they have many early catalogs and I guess are in the process of scanning much more. There is Jack Taylor, Elswick ,Rudge, and BSA and Constrictor