Gravell also played 12 games for invitational touring team the Barbarians. First selected in 1975, Gravell faced an Australia XV at the start of 1976 before joining the Barbarian tour of Canada later that year where he played in six matches. In 1977 Gravell played his final match for the Barbarians in a star-studded team that faced the returning 1977 British Lions in a charity match to celebrate the Silver Jubilee of Elizabeth II. Although Gravell ended on the losing team, he scored one of three tries for the Barbarians in a game seen as a classic encounter.