Final answer:
Bernard Marx plans to take John and Linda to London to gain personal status by showcasing their different upbringing as a source of entertainment to the society.
Step-by-step explanation:
Bernard Marx is eager to take John and Linda to London because he sees an opportunity to leverage their unique backgrounds to his own advantage. John, being born and raised outside the London society in the World State, represents a novel and exotic figure that could capture the attention of the London elite. Bernard's plan is to exhibit John, known as the "Savage," not to introduce them to the city's culture or for educational reasons, but rather to gain personal status and to offer entertainment to the society by highlighting John and Linda's contrasting upbringing.