Doctor Who: Imaginary Friends a 1960s story

*Part of the six books for six decades collection* It's Christmas, 1963, when nine-year-old Gerald starts dreaming of strange worlds and monsters His parents think it's harmless at first. But Gerald is convinced it's real - his dreams of Daleks and cavemen and insects as big as a person. Desperate for help, what Gerald's family really need, right now, is a Doctor.