I wouldn't bet my grandma's immortal soul on it, but I always thought it was Lewis. Huh, let me see if I can find it....
.....that is odd. Well when I get around to getting the tape converted I will see what it says but all these years I thought it was based on one of his stories. Still cool whoever wrote it, but now I'm puzzled.
Okay, at some point between age eight and now I got confused about the title and author. Nope, not CS Lewis, but someone named John Masefield, and it was
Box of Delights. Good call, you were right.
This is what it was:
https://en.wikipedia.org/wiki/The_Box_of_Delights_(TV_series)