Zac_A:
… I’m not going to fall into the trap of advertising, but I’ve already booked another course with a company I’ve used (in a real classroom situation) before, and after talking to them on the phone I’m confident they’re making big efforts to provide a decent quality session, knowlegeable trainers who won’t lead you astray, and a not-too-unbearable 7 hour session, which is pretty much all anyone can hope for.
Hi Zac_A,
The part of the quote that I’ve made red shows how that would NOT count as an advert, and that’s because it is a recommendation. 
An example of an advert would be you (or the company you work for) offering ■■ course at ■■ £price and inviting folks to get in touch about it.
TN (DVV Media International) does have the possibility to advertise, and I’ll put anybody in touch with the relevant department if they ask me. (By PM.)
In the context of your quote above, it’s perfectly OK to name the company as long as you don’t have any connection to them.