Krikkitmen is *very* much based on Life, the Universe, and Everything -- or at least, the original plot was what Adams repurposed into that book, and then Goss has taken big chunks of Adams' earlier drafts, some of the book itself, and some bits of other work by Adams and reworked them into it. You'll find yourself occasionally finding whole chunks of prose from Life, the Universe, and Everything, repurposed.
(I wrote a review of it when it came out https://andrewhickey.info/2018/01/20/doctor-who-and-the-krikkitmen/ -- I think it's both a good book in its own right and one that's interesting for the notions it throws up about intertextuality and authorship. I also found it to be a book that was a lot more resonant when it was released than it would have been had it come out when Adams first had the idea.)
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(I wrote a review of it when it came out https://andrewhickey.info/2018/01/20/doctor-who-and-the-krikkitmen/ -- I think it's both a good book in its own right and one that's interesting for the notions it throws up about intertextuality and authorship. I also found it to be a book that was a lot more resonant when it was released than it would have been had it come out when Adams first had the idea.)