To be honest I was a little surprised when I heard about the exhumation of Sikorski. As you may recall, he was the leader of the Polish Government-in-exile during WW2 and died in a plane crash off Gibralta in 1943. There have always been theories and counter-theories about his death. Some point to Stalin, while others point to Britain. What they all agree on however, is the fact that the plane carrying the Polish Prime Minister crashed in the Med.
Therefore I am unsure as to what is expected. If the plane was sabotaged, or had a bomb on it, then the body will unlikley show signs of this. I stand to be corrected, but feel this will turn out to be an expensive waste of time.