Re: "The Art of Hacking"
" if you're spending all this money getting courses made that are supposedly useful in cyber defence, why not just publish them so everybody can have a gander."
Because these courses are not created by UKGOV, they are commercial training courses that the government buy on a per-seat basis. Since they don't own the IP, they can't sell or give away the courses. A bit like you can't (legally) make copies of Hollywood DVDs and sell them in the marketplace.
 Anachronistic reference.