The starting Marshall signals to the Ref that the riders are line up,then proceeds to walk away ,their will be a slightly longer delay until he clears the back wheels before ref releases the tapes.Its called the Sarjeant rule
I see Peter Collins is 65 today according to BSPA site.
What a great shame that there is such a rift between the Collins family and Belle Vue.
PC is the most gifted talented rider I have ever seen. Seeing his career is the most joyous part of my 57 seasons of watching Belle Vie