Mary Poppins: Brian Sibley's sequel that never was

"Brian Sibley is one of writing's multi-hyphenates. He is a prolific and award-winning writer of radio drama, such as Radio 4's acclaimed Lord of the Rings adaptations. He has written plays of his own and many books focusing on film. The subjects of his biographies range from CS Lewis to Mickey Mouse."

He loves Disney, very unlike the Professor

I wonder if Mary Poppins was one of the films that Tolkien disliked from Disney?

http://www.bbc.co.uk/news/entertainment-arts-24581937