* Definition of "movie": Do we include TV movies, miniseries, or just full-length theatrical releases?
* Different adaptations: Some books have been adapted multiple times, with different versions released over the years. Do we count each adaptation separately, or just the original movie?
* International productions: Blyton's books are popular worldwide, and many adaptations have been made outside of the UK. Do we count these as well?
That said, it's safe to say that many of Enid Blyton's most popular series have been adapted for the screen, including:
* The Famous Five: Several TV series, as well as a recent movie
* The Secret Seven: Several TV series
* Noddy: Numerous TV series, including recent CGI animation
* The Wishing Chair: A popular TV series
* The Faraway Tree: Various TV series and a movie
* Malory Towers: Several TV series and a recent movie
However, not all of Blyton's books have been adapted. Many of her stories are aimed at younger children, and may not be considered suitable for a full-length movie.
Overall, it's a lot more than just a handful, but a precise number is difficult to provide.