Part of showing that you are interested in the job and fully engaged in a future with Heathrow Airport will be asking great questions for your interviewer. As the end of your time with them nears, your interviewer will ask this to ensure that you don't walk away with any questions left unanswered. Keep in mind that just about any question is fair game, as long as it doesn't creep into unethical or illegal territories. It's a great idea to come prepared with a list of questions for your interviewer and keep it in front of you to take notes during your interview. To impress the Heathrow Airport team, show interest in the overall business operation and success.