Board Thread:The Panopticon/@comment-1293767-20130929202135/@comment-26975268-20130930235405

Okay, TD:HLAT is (probably) totally out. There are many ref books out there that give original information, but these are not valid sources for in-universe material. Now I don't own the book (not yet, at least), but this seems to be the case. If it's genuinely short stories with real-world content in between, it can be discussed. But I don't know enough about it to properly discuss it. When I do read it, I'll get back to you.

The Book, on the other hand, I can see right in front of me. I think it's more of a promotion than a proper story, sorta like Strax Field Report but for prose. It seems to be really, really on the edge of the real world, discussing the big people behind the scenes:
 * It knew so many stories that the man himself must never hear – stories told by the clever woman called Verity, the warlock Robert, Terrance (the scribe with a pleasant, open face), and Steven – the Guardian of the Future.

But then Tom Baker expressly appeared in TV Action!, and we still consider that one valid.