Finding Books on the Education of Randy Morrow?

Not Randy At All asks: "In an effort to get my young sons interested in some sort of science subject I am trying to find some books which I read as a child in England. Written for kids rather than adults, this was a series of books where a Father who (I think was some sort of technical journalist) always got his kid interested in the stories he covered. The only one I remember clearly was the book where the kid studied for his ham radio license. All of the books covered one science subject, I'm pretty sure that they included geology, and the only other thing I remember was that the kid was called Randy Morrow. Do you Slashdot readers remember these books and can you point me towards some of the titles? Obviously I've tried the usual sources, including Amazon and Google, but they have all turned up blank."