What about the 33% to espionage?
What does the espionage skill?
Excellent question. I've wondered what all the +5% to espionage does from anamolies as well. The only thing I can think of is that the bonuses affect the costs of spies on your slider, or rather you get more spies for the same money.
Specifically 33% (example) more spies than you would otherwise get when spending 10% (example) of your economy on espionage.
As there is no success rate so to speak with a spy being placed on a tile or being used to remove one from one of your tiles, this would make the most sense.