By Guy Taylor Introducing duty-free shopping for arriving passengers would make the UK’s aviation and tourism scene more competitive internationally, according to the boss of Gatwick Airport. In an interview with City A.M., Stewart Wingate, who has led Britain’s second largest airport for over a decade, said: “One of the things we continue to lobby the government on is why we don’t take advantage now that we are outside of the EU and offer that product to passengers arriving into Gatwick or the other UK airports.” More than 60 countries around the world have implemented arrivals duty free, inc…