Back on March 5th I asked the question But Were They Region 2 DVDs? in reference to President Obama's gift to the British Prime Minister.
According to the British press, they were not Region 2 DVDs.
Prime Minister Brown was sent home with Region 1 DVDs, which are meant only to be played in the United States. Region 1 DVDs can only be played in Europe with a special "all-region" player, which the Prime Minister apparently does not own.