Finally, resolved! And in my 25+ years of flight sims it was a strange one. I decided to take a look at the stock AFCAD so went through ADE to open the stock KFCA file and ADE said not found. I searched the Scenery folder and actually found the file but it was corrupted, I guess. Thought about it a bit and decided to do a P3D Scenery update. Followed Elaine's excellent instructions and updated, re-installed Global Base (really important!), HD Trees and viola: