Astral Admin - Mwahahaha!
You haven't seen City of Death yet? That's a shame, as I still think it's the greatest Doctor Who tv story ever broadcast.
I think it was in the Romana years, which was when I stopped watching Dr Who. I couldn't stand K-9 and Romana as assistants!
Did you read Douglas Adams Dirk Gentley books? The story is similar to one of those (not sure if it was the first or the second - the one with time travel.)
I read Dirk Gentlys Holographic Detective Agency, but unfortunately it made no impression on me at all, and I can't remember *anything* about it