Well Known and Active Forum Website User
The Silodrome site that StepXL linked to looked interesting. This page looks intriguing. I have seen the pic before, maybe here. There was controversy if it was photo-shopped, but the rider wasn't named. I don't think Surtees was a knee dragger, especially at 15 yo. Duct tape for the knee and lace up boots seem out of place, too. Also, that bike looks a lot more Shadow than Jack Surtees Lightning.