Fantastic collection and it's fun trying to make out what they are. Looks like there are some duplicates as well.
Here is my bookcase, which is mostly Blytons, but also some others.
On the second shelf are the books I grew up with, my paperback Find Outers, mostly bought out of pocket money (as were most of the Malcolm Saville paperbacks). I collected the FFO hardbacks much later. I also had no Secret Sevens as a boy, and had only read them from the library.
Notice the precious and few Cherrys books at the end of the second shelf.
I have another bookcase for Jennings, Hardy Boys, Williams and Bunters.
I also have some Biggles books, but not 70!
I must say that the old books with faded covers might be nice to have but they do make the display look a bit shabby!
edit: the site I used for hosting photos seems to be gone, so I will have to do this again sometime.