Can I say I've never encountered an 8-inch disk? Never even seen one in a museum either.
We did have a load of BBC Micros in my first school and a load of 5" floppies for those though. We all had a good gigglg using pencil to cover up the 'f' in Shift on the keyboards.
Hmm, this brings back memories. We also had "concept keyboards" (now called overlay keyboards) for the dyslexic lot.