In case anyone here is interested, the official Gerry Anderson webpage has pre-orders up for the official Moonbase Alpha Technical Manual out later this year.
I've ordered that and Space: 1999: The Vault by Chris Bentley.
Anyone else read any of the Powys Media Space: 1999 novels? They've been going for about twenty years. It's a very small press putting out novels licenced by the IP owner. They've published several types of books: original novels set during and after the show; reprints of the novelizations from the 1970s; reprints of the original tie-in novels from the 1970s; and nonfiction companion books.
What's pretty near unique about them is that they've developed their own canon, their own take on things like the Mysterious Unknown Force, and their reprints of the 1970s books are rewritten to be consistent with that story arc, even if it means overwriting things we saw on TV. They made an early effort to draw some familiar names to the line, like David McIntee, John Kenneth Muir (author of nonfiction books on Space: 1999, Blake's 7, and Doctor Who back around the 1990s), and Brian Ball, who wrote one of the 1970s novelizations, but most have been written by a guy who was a friend of the original publisher and more or less took over running the show, writing most of the later books that explain the big mysteries and set up an ending for the series. Some of the books are pretty good, but the arc and the answers to the big questions are... well, I'm no writer or publisher, but it seems to me a Mysterious Unknown Force is a lot less interesting when it's a Prosaic Known Force.
The books are also expensive, being print on demand books that probably sell in the hundreds of copies but have to pay licencing fees. The reprints of the old 1970s episode adaptations are available as two oversized hardcovers. I paid a hundred bucks for one probably ten years ago, and the other one has been recently put on sale for a perfectly reasonable US$260, including postage to Canada. I'll pass on that. I have all the originals. A mass market paperback-sized book is around $20-$30.
One thing they're doing that may be worthwhile for fans who've missed out: EC Tubb's rare 1970s novel Earthfall is being reprinted without Powys arc revisions. As far as I know it was never distributed in North America back in the day, and I didn't know it existed until maybe twenty years ago, and it took a year or two to find a copy from an online seller. It was reprinted a few years later but was only available to members of the official Gerry Anderson Fan Club (or people who knew a member) and went quickly out of print again. This is a complete rethink of Space: 1999, taking off from Breakaway then pretty much ignoring the rest of the series entirely to tell its own story. It's a pretty good read.