Trying to identify, and locate, a childrens book I read as a kid in the mid 70's - all I remember of the story is of a young boys discovery that the dinosaur sculptures in Crystal Palace Park magically came to life at night...that's it I'm afraid!

I grew up near the park, and used to clamber over these dinosaurs as a young boy - as you can imagine, this story captured my imagination - and awoke a passion for reading that has lasted to this day!

Any ideas? Thanks.