Welome, Gumtree !
JoanP, Marina Warner's beautifully illustrated book is a treasure one longs to have and hold, and turn to again and again. I read it in June and have just reordered it from the library for this discussion.
The author deals first with The Tellers (Part One, Chapters 1-12), continues with The Tales (Part Two, Chapters 13-22), and added a Conclusion.
She starts with the earliest figures and symbols: the Sybil in the Cunnean cave, enchantresses from classical mythologiy, biblical figures in various guises according to different traditions in different parts of the world (e.g. Saint Anne, he Queen of Sheba).
Gossip and transmission by word of mouth establshed and carried forward the tradition until Charles Perrault, whom you mentioned, collected and brought out The Tales of Mother Goose, well before the Brothers Grimm wrote theirs.
Warner points out that there is a dark side to some tales (very different from Disney's romanticized, "sanitized" versions), representative of all human traits, some anything but pretty - in short, the human condition.
I have not read anything by Bruno Bettelheim, only about alleged controversies laer in his life.