As you may have noticed when you submitted your formal application, Heathrow Airport doesn't clearly outline the educational requirements for their openings. If you've been invited to interview, your interviewer has a good feel for your educational background from your submitted application materials. They pose this question to give you the opportunity to elaborate on your education and how you can apply what you learned to the job you are being considered for. Walk your interviewer through your education and discuss specific job duties you feel fully prepared for because of it.