As I said yesterday in the live feed topic. If they are going to reveal it they may as well have him do a dramatic exit first.
He should go mental, start swearing and shouting at everyone, then running into the garden shouting even louder, going completely mental. Then he should pick up one of the garden chairs, throw it across the garden and run out a fire exit. Big Brother comes on with "Would Michael come to the Diary Room immediately" - no response - BB then says "Could all housemates return to the house immediately" - garden blinds close.
Then later in the night Big Brother calls housemates to the sofas and says "Due to events earlier today, Big Brother has decided to remove from the Big Brother house". Then they can show both of Michaels VT's on the screen, then jump to him in the diary room, Big Brother thanks him for being the people's puppet. The end. Or even better, don't reveal the mole thing at all. Make them believe he really did go out the house like that.