What's the implications for an aerodrome (or even a runway?) to be licensed, or not? (insurance, perhaps?)
I seem to remember there was a time when tuition was only allowed at licensed a/d's, but this is no longer the case? What relevance remains?
A licenced airfield should guarnentee a certain level of runway condition, mostly in the case of grass fields, but free from FOD and pot holes at least.
It also indicates a level of fire cover. For small GA strips this usually means training the girls who make the bacon sandwiches to use the fire equipment, and having a ropey old Land-Rover with a tank of foam and hose on the back.