I'm pretty sure that will not happen. I believe Broadfoot Publishing holds the copyright and will want to earn their moneys worth before making it accessible online - which is understandable enough, given the time and great effort that they have invested in the project. That's also why they do not sell individual volumes, just the complete set. Once in a while, though, single volumes turn up at some booksellers. With the help of the table of contents, it's possible to single out the volumes containing the information you want if they are offered for sale.