The Beatles Stereo Vinyl Box Set was the same text that Kevin Howlett used for the CD booklets, or whether it was expanded upon. So we asked Kevin. Here's his reply:
There is a chapter on each of the albums. I've expanded the original notes a great deal. I've also written an Introduction, which includes quotes from interviewees featured in my 2009 radio series The Beatles: Here, There And Everywhere. There are also chapters about the remastering process and how the vinyl cuts were made. It's beautifully illustrated.
So there you have it. Another reason to get the full boxed set.