Fantastic Mr Fox, The Witches, The Twits, James and the Giant Peach, Charlie and the Chocolate Factory, The BFG, The Magic Finger, The Giraffe and the Pelly and me, Esio Trot, Boy Tales & Childhood, Matilda, Charlie and the Great Glass Elevator, Danny the Champion of the World, George's Marvellous Medicine Going Solo
If you haven't had a reply to this yet. I see it is almost 2 yrs after the fact. Teachers began reading these stories to me when I was 7 and eight. My niece at 6 wants to read these. So anything over 6.
I've read a few of them to my 5 year old and maybe even before he turned 5. Charlie and the Chocolate factory, The Great Glass Elevator, The BFG, The Fantastic Mr. Fox and George's Marvelous Medicine are the ones we read together. I don't believe they're "dark" and would recommend them as long as the child is old enough to sit still and follow the story. A few of them have been adapted into feature films also: Fantastic Mr Fox, James and the Giant Peach, Charlie and the Chocolate Factory and Matilda are the ones that I know of. GREAT movies also!