Some really good shouts on here and I'd just like to add Tony Davey. Only started riding late 1970, had a handful of matches at the tail end of the season to average 3.38. On to 1971, he achieved in his first six matches scores of 15-5 (away), 15-5 (a) + track record, 12-4 (h) + T/R, paid 14-5(a), 15-5 (h) 9-4 (h) plus a fall. Ended the season on 9.93, with 9 full and three paid max, finishing 7th in the overall averages.
What could have been but for the terrible hand injury the following year....