As well as Enid Blyton, annuals (Judy, Bunty, Diana, Jinty, Princess (I devoured them all) and children's classics like Mary Poppins, Nurse Matilda, Black Beauty, the Katy books, The Secret Garden and Little Women, I loved historical fiction. Much that was written for children in the 60s and 70s isn't in print any more, but some of the titles and authors might be familiar to people of a certain age:
Child of Ebenezer - Angela Bull. 19th century industrial town in the north of England. A lonely little girl grows up with her factory-owning father (her mother died when she was a baby) in an atmosphere of religious bigotry and fear about "The Irish Question." Really powerful stuff - I loved it because of how Bull treats her young readers as intelligent beings, capable of understanding complex issues.
The Grandmother Stone - Margaret Greaves 17th century setting, mostly on Sark (Serq in the book.) A rebellious fourteen year old is packed off by his mother to live with his grandfather and finds himself in a place where witchcraft, or rather the belief in it still holds sway. And looming over the island in the vague shape of a woman is the ancient Grandmother Stone. . .
Barbara Willard - Mantlemass books. I can't remember specific titles, but they were also 17th century set
Hester Burton - Time of Trial (amongst others.) Early 19th century. It's 1801 and the authorities in England are twitchy. If the French can chop off aristocratic heads, what's to stop the English doing the same? The story concerns the Pargeters, Margaret, her brother John and their father as they try to survive the upheaval around them.
A Candle In Her Room - Ruth M. Arthur, early 20th century. Three young sisters encounter a sinister doll and their lives and those of succeeding generations are affected forever.