sentences:  He followed this by breaking the one-hour record at Herne Hill Velodrome on 26 May by almost 1400 yards to record 25 miles 1520 yards.He then improved the 50-mile record in the same event the following year and broke the world amateur hour record with 26 miles and 838 yards at Herne Hill in June 1926.Southall was selected by the National Cyclists' Union to represent Britain at the 1926 UCI Road World Championships, where he finished in eighth place.