Although he was a member of the bronze-medal-winning Great Britain pursuit team at the 1928 Olympics, Monty Southall was better known as a tandem rider. With his older, and more successful, brother Frank, the pair regularly took part in challenge matches with the famous Wyld brothers from Derby, three of whom, Lew, Harry and Percy, were in the 1928 Olympic pursuit team with Monty. The Southall-Wyld challenges were big crowd pullers in the late 1920s. However, when Monty won the NCU London Centre Tandem Championship in 1929, his partner was not brother Frank, but Charley Hallerback. This pair also set a new one-mile paced tandem record that year, and in 1930, broke the 24-year-old record for the half-mile tandem flying start set by the legendary pair Johnnie Matthews and Arthur Rushen. As a member of the Norwood Paragon team, Southall, along with brother Frank, Hallerback and Charlie Bowtle, won the 1929 James Blair trophy as National Club Team Champions over two miles. That year Monty came close to winning his first individual title when beaten by half-a-length in the NCU London Centre 10-mile Championship at Herne Hill, and there was even more agony in the race 12 months later. Leading by three lengths with 300 yards to go, he tired rapidly and was overtaken 10 yards from the line. After his racing days, Southall worked for the Post Office as a skilled tradesman.