Hartley’s Restaurant has become a Dún Laoghaire landmark since it opened in 2007 in the old Victorian railway ticket office overlooking the harbour. It was started by Julie Shiels and her wife, Kirsty Argyle, both chefs, who had already been in the restaurant business for years before that. The couple have two daughters who might take over the family business one day… “But not the way things are at the moment,” Shiels tells The Currency. “We’re incredibly busy, busier than we’ve ever been,” she says, “It’s not possible to be any busier, we don’t have the space,” but “we make…