George Messum represented England Students whilst studying at Loughborough University. He also played for Northampton Saints and Bedford before winning a Blue for Oxford University in the 2014 Varsity Match when the Dark Blues scored their record win (43−6) and in doing so notched a fifth consecutive win for the first time in the fixture. He was elected OURFC captain for the 2015−16 season but was prevented from taking part in Oxford's record sixth consecutive Varsity Match victory owing to new eligibility rules surrounding degree courses. He returned to win another Blue in the 2019 match. He currently plays for Old Elthamians in National Division 1, tier 3 of the League setup.