In an era of iPads and glass cockpits, a dusty set of reference books—now largely digitized—continues to be the definitive rite of passage for student pilots across the UK and Commonwealth.
While these are commercial textbooks, they are available through several official and educational channels: air pilots manual 1-7 pdf
You can have the convenience of a PDF without breaking the law. Here is how: In an era of iPads and glass cockpits,