I'm looking forward to seeing this. I love it when people in the public eye come out and talk about being in the spectrum. I love it because it demonstrates in the most powerful way how diverse the spectrum is. Soon, perhaps in a decade or so, we (those of us who are high functioning) will no longer be be told, "well, I would never have guessed." Or, "But you look so normal to me."
Even here on WP I have observed how challenging it is for people in the spectrum to be accepting of difference. Difference of expressions of autism. Often it frustrates me how even people in the spectrum can be so judgmental and lacking in acceptance of their fellow brothers and sisters. This obsession with black and white thinking over rational mindedness.
When people as high functioning as Chris Packham talk about their life, we can all wake up a little more to the deeper truth that autism is not quite what you see. It's an experience that cannot be put into a convenient one size fits all box.