> It is in "The Restaurant at the end of the Universe"

That's in the books, which were a complete rewrite. The TV production followed the original radio script rather more closely, and *that* ends with the Question being found at the end of Fit the Sixth. (Fit the Fifth took place in said restaurant.) I used to regurgitate HitchHiker by the quarter-hour, much to Herself's embarrassment .... Be Told.

While we're here, a genuine incident: When HitchHiker first came out in paperback, my father sent me a clipping from the Grauniad about it, so I went to the on-campus bookstore.

"Have you got a copy of the HitchHiker's Guide to the Galaxy?"

"I'm sorry, we don't sell travel books."

.... and I was ten yards out of the bookshop before the penny dropped.