I think the 8pm time slot is about right. It is family, but not young family. My DCs are watching but at 6& 8-9 are probably younger than most. The 6yo will be taking it at face value of an adventure. My older one is asking lots of great questions. It's great for him as his dyslexia means that he can't process the text of novels for pleasure, but intellectually he can manage this level of story. They were bemused at me being a snotty, sobbing mess as Billy died in his mother's arms, as I had my little boys snuggled up with me 
We've watched some 90s classic book adaptions such as Moondial and some of them feel quite blunt compared to modern dramas. Some of it is the slower pace and more stagy acting that gives you more time to process the story rather than being whipped through. I'd love the full 7 Narnia books to be adapted. The 80s-90s versions were brilliant for their time.
My taste in literature is firmly stuck in young adult fantasy such as this, and Garth Nix 