The Book of English Magic. A really good introduction to all aspects of occultism from alchemy to mediumship, cunning folk to modern Wicca, and many more. It has reading lists at the back of each chapter if you want to delve further into any subject. I thoroughly recommend it!
Book I'd like to read - Until a century ago cunning-folk were well-known figures in English and Welsh society. These practitioners of popular magic offered to solve a myriad of problems relating to ill health, theft, love and the future.
The Golden Bough: A Study in Magic and Religion (Paperback)