Over the years, the route of the Poly Marathon varied. From 1909 until 1932, it ended at Stamford Bridge in west London; then in 1933, it moved back to the White City stadium, where the 1908 Olympic marathon had finished. From 1938, the race ended at the new Polytechnic Harriers stadium in Chiswick, west London. It was on this course that Jim Peters, the greatest marathoner of his day, broke the 2 hours and 20 minutes barrier in 1953. Even more remarkably, remeasurement showed the course to have been about 150 yards too long.