Ark Royal to pay off 2012, Illustrious 2015
According to a post elsewhere. It looks like Illustrious will be retained longest due to her "strike conversion", albeit sans aircraft most of the time. Ark Royal's pay off in 2012 if only 6 years ahead of Ocean and both operate in that roll. That means the CVF will have a secondary LPH role. Somehow I can't ever see them being used in that way.