By Maria Ward-Brennan For the best part of two decades, this time of year would see Wayne Barnes working out his travel plans ahead of rugby’s Six Nations tournament. The rugby union referee, who hung up his whistle after refereeing last year’s World Cup Final in Paris and took charge of his first match in the European showcase back in 2007, has now traded in the boots for the books full-time, as a partner at law firm Squire Patton Boggs. He joined the law firm in January 2022 but as we speak is now three weeks into being a full-time partner at the firm’s government investigations and white co…