Found on eBay, the seller is MotoringMagpie who seems to operate a "real" bookstore called Pooks Motor Books in Rothley, Leicestershire with a web site
http://www.pooksmotorbooks.co.uk/
The eBay listing is at:
http://cgi.ebay.com/AUSTIN-K5-MILITA...3A1%7C294%3A30
I have bought from them on eBay in past and been satisfied with their descriptions and service.