Each vehicle had an associated book released sold separately from the toys themselves. Marine, Polar, Terrain and Space were like the toys exclusively available from BHS and were just part of the merchandise range. The main page artwork was by famed artist Mike Noble (TV 21) and contained 2 stories plus some fictional technical information on the vehicles and trailers. The center page also offered a view of the entire range of vehicles. I have scanned mine to PDF files on high quality, download them from below. Right click on the link and open new window as Google doesn't like iframes.

https://drive.google.com/drive/folders/1gZi3e2gszAxWj9bLyK9Tk0z7DuZJKpCI?usp=sharing