Good question Airtrooper, not alot on the airfield site that's for sure, it is one of those bases that appears to have been almost completely cleared.
I believe the original gym and chancel is still there, but now part of private land near a main road, as are various other buildings. The buildings were largely of temporary brick construction and the odd example still survives hear and there, but not much to look at.
If you give me a moment or two I will have a gander at my site plans and GE and try and figure out what remains.
Predannack airfield is quite easy to access from the coast path on weekends, you should be able to get reasonably close to the tower. If it's a nice day then the ATC gliders will be flying, it is always best to work with these guys that try skulking around in the undergrowth so to speak.
Everytime I go it is thick fog, hence I have no pictures of the place!