Hi,
I have a British "Brown Brothers" Illustrated Catalogue from 1952, the bulk of which is devoted to bike parts and accessories (but there's also some other stuff such as toys etc.). I have started to scan it and put on wooljersery, and eventually (as time allows) plan to scan most of the bike-related pages, but that may take a while. But, I have already scanned/uploaded the index pages, and if someone sees something of interest you're welcome to email me the particular page numbers that interest you, and I'll try to oblige.
The first index page is here http://tinyurl.com/
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Cheers,
Dmitry Yaitskov,
Toronto, Canada.