A british mag, Sideburn, has a special edition online about Royal Enfield and it's involvment in Flat Track Racing.
https://issuu.com/sideburnmag/docs/sideburn_x_royal_enfield_special_ed_16b39ee7e531ab
That was a really good read. I may be a bit biased though, owning 2 Enfields, and love me some Flat Track!! Can't wait to see one in action at a AFT race. Also quite interested in the Slide School training.