Hello Jon,
Since you are interested, I'll start you on the dead-simple tap test. This assumes that the blades are made with carbon fiber or fiberglass that was laminated on a foam or wood core. I can't be certain, but the website of Unitron leads me to believe the blades are made that way.
All you need is a big heavy coin, the heavier the better. I think the UK has some big coins in circulation like the 2p coin, which is good enough. Lay each blade flat on a table, and tap-tap-tap on the blade, moving along slowly so that you tap every centimeter or so. Tap along the blade chord starting at one end, then come back across the chord one cm over, and repeat until you've tapped across the whole blade.
If the bonding of the carbon-fiber skin to the inner core is intact, then all of your taps will sound rather similar: sharp clear "tak"
If your tapping crosses an area where the skin has delaminated from the core, then the sound gets absorbed into the empty space between core and skin, the sounds becomes a duller "thuk"
Repeat for each blade, top and bottom. Some internal structure inside the blade will become apparent, such as spars, ribs, or joints made during manufacture, so not all changes in sounds indicate a problem.
It will be obvious, I guarantee you, so don't worry about calibrating your ears before starting. If you find any of these delaminated pockets, then start recording things critically. Make a diagram of the blade, and when you find a delaminated zone, sketch it on your diagram. Measure the center of the zone on the blade and mark that on the diagram. Make a separate diagram for each blade top and bottom and mark any delaminations you find, showing how big they are and what the location of the zone is.
I've attached a picture of an Exmork exploded blade that didn't survive a storm (save that story for another day). Just to give you an idea of the simple structure inside these types of blades.
