It will cost you £4 to find out if he is a spy. How you might ask? Well ...
Items
-------
Bottle of Cheap Vodka - £4
Procedure
------
1)Befriend the pigged one and offer him a bit of your vodka, then get him slightly drunk.
2)Wait for the plans to be spilled in a drunken ramblement.
note : an equal ammount of vodka may need to be drunk by said person in order to understand the language that spews forth from drunken mouths..
That ... or the spanish inquistion, cos nobody expects the spanish inquisition!!!!!!