This tread has brought back so many fond memories. I loved the FF series as a kid, I think I had every book up to about the 50's. There were two brilliant support books atoo. I can't remember the exact titles, something from the "pit" and "Titan" I think.
I remember by teacher at the time mocking these books and telling me they had no educational value. What utter tosh, these books sucked me into reading, somethign which I still do today. So many people looked down on these at the time, but they failed to appreciate that the most important thing in getting kids to read is engagement.