The wording that Mills chose in 1933 led to the NCU's long civil war with a later rival body, the British League of Racing Cyclists. Mills wrote: "No massed start race shall be permitted, other than on an enclosed circuit, unless the course is closed under statute by the competent authority, to other vehicular traffic." Nine years later, in October 1942 and after the BLRC had broken away from the NCU because of that insistence on closed roads, Mills regretted what he had done: "In 1933 it was impossible to foresee the future... the war, the changing conditions on the road, the decline of track sport, the growing demand for massed start under real road conditions. My notes covered conditions as they existed in 1933."