The booklet is from the Imperial War Museum and is called "Photographic records of the great war" You can see some pictures I took here
It recently came into my possession when my grandfather gave it to me, he can't remember where he got it from so unfortunately i'm left in the dark in that respect. Upon doing research and looking for this particular book all i found was a PDF of it on a shady website I won't share on Reddit, and a similar book but instead of "Army" it was "Air Force" for sale on the internet that looked like it was printed recently.
Mainly I just wanted to know if this could possibly be from the time it was originally published (1927) and if there is any sort of value in the item. Most of the pictures inside are easily found on the internet with a quick search of "World war 1" on google, but there are also a few i'd never seen before in all my time studying. Thanks in advance for any more information!
A good place to start when looking at the value of old books is antique book shops. Here's one of the largest ones for English books: https://www.abebooks.co.uk/servlet/SearchResults?ds=20&kn=photographic+records+of+the+great+war+1914-1918&sts=t
As you can see, the price is between £4-£12 for fair condition. I'm not sure what you mean by the spine being "ripped", but if the book isn't holding itself together, you can usually cut the price in half, no matter how good condition the pages are in.
The only photo provided of the actual photos is very blurred, so it's hard to say if it's a reprint or not. You can usually tell, especially if it's a recent reprint, even without comparing it to the real thing.
Photos, having been rasterized once, tend to be unnaturally dark or having too much contrast (mostly black and white, lacking the greys), and may exhibit moire, low resolution halftone dots and other obvious defects.
Additionally, a modern reprint (especially a laser print job) usually has the text printed on top of the paper, whereas old books usually have the text either pressed into or "sucked" into (for instance, in offset printing) the paper, and you might be able to see the difference looking carefully against the light at an extreme angle.
Based on all of this, without having seen the book in person (so don't count on me being entirely correct), I'd say it's most likely an original from 1927 and it's worth between £2-6 if you find a buyer.