The thing that sold it for me was after Verity Lambert left and the new producer was giving instructions and Hartnell (for it was he) said "I can't close the doors from this side of the console". To which the disembodied voice said "does it matter?".
"Of course it matters".
Hartnell totally understood.
Did you not get him in makeup for panto a few years after he left DW? It was strange because he had a disconnect between what he was doing and what he was saying. His daughter's comments were very touching too.