Certainly one of the Goodman brothers was on the large side. But the guy's face looks familiar, and I will look until the penny drops.
When you say David Whitworth, I presume you mean M.D.Whitworth, who rode Triumphs around Brooklands. Yes? Well he rode the Maudes Trophy with my father in 1938, and from the photos I have he doesn't look like the David Whitworth in these photos that you have been identifying. Hmmmm?
And to be fair, Ginger Wood looks different in the photos I've seen of Ginger Wood.