I just spent over and hour reading through this site. I first read the books when I was quite young, probably around 8 or 9 and have reread them a few times since then. My sister, Ann, and I got obsessed over the BBC production of books 1 and 2 (they never did book 3 due to high costs and low ratings) and I still have them all on (old decaying) video tape in my basement. I think I’ll need to rewatch them soon.
This site contains more information than I thought possible about the books, the tv series and much more. It’s well worth any fan’s time to visit.
And if you haven’t read the books, do. They’re quite good.