I missed a third of it dammit. It's on again tonight, BEEB ch4.
Looks like it's been a recapitulation thro' Mendel, Lemarc, etc. It's called 'What Darwin Missed'.
It's 'What Darwin Didn't Know'
Excellent documentary on all the sciences, fossil discovery (and mathematics) that came after Darwin that was able then prove beyond doubt the fact of evolution.
It showed Darwin's foresight in his assumptions in Origins of Species which he could not prove or which seemed problematic, that could now be clearly demonstrated.