Brown vied with Ben Foden for the England full-back spot in 2012, coming off the bench in the victory over Scotland at Murrayfield. He spent the 2013 Six Nations playing on the left wing with Alex Goode taking the number 15 jersey. He was finally picked at fullback by Stuart Lancaster and was subsequently named England's Man of the Series following his form during the 2013 Autumn Internationals. Brown scored his first try for England in the 2014 Six Nations Championship match against France on 1 February 2014 and his second came a week later in a comprehensive 20–0 victory against Scotland. He then scored two tries and was named Man of the Match for the third time in the tournament in the 52–11 away win over Italy in Rome. In recognition of Brown's form throughout the 2014 Six Nations Championship, he was selected by the general public for the 2014 RBS Six Nations player of the championship award.