Am in a bit of a rush here. Suffice to say he seems to have been gradually forgotten, and yet he always knew how to give a convincing performance, either as jolly amiable men or acerbic doctors such as Sir Lancelot Spratt.
And as his entry on Wikipedia states, he had other talents and notable experiences:
"He fought in the Spanish Civil War, on the Republican side, served as a sailor in the Royal Navy during World War II, unsuccessfully fought a constituency for the Labour Party in the 1950 United Kingdom general election, and became Rector of the University of Edinburgh."
What they fail to mention is that he was also a professional falconer, who trained Prince Charles.
There are more to actors than meets the eye you see!