Just a few years ago, Brexit was top of mind for Paul Stewart as he attempted to survey the new realities of doing business for his Belfast-based company My Baggage. The company, founded in 2009, provides door-to-door shipping services for luggage and other personal effects internationally. Its customers are mainly students and professionals moving to new countries for study and work. “We help people move their luggage abroad when they go to work or study, mostly in America, Australia and a wee bit in Asia,” Stewart, who is managing director, said. Understanding customs agencies has always been part of the…