Has any of Morris gleitzman books been turned into films?

Yes, several of Morris Gleitzman's books have been adapted into films. Notably, his novel "Once" was adapted into a feature film in 2015, and it was well-received for its poignant storytelling. Additionally, the sequels "Then," "Now," and "After" are also part of the same narrative universe, though they haven't been turned into films as of my last update.