Here’s a brief quote from Tom Baker, talking about Jon Pertwee. Short, I know, but worth it because there aren’t too many examples of him talking about other Doctors:
“I only met Jon Pertwee for the first time at the changeover shot in his last episode. So up till then I had no knowledge of him.
“Later I met him in various sound studios where we doing voice overs or commentaries and so on. Also I met him on several occasions at Sci-fi conventions. He was always very glamorous and charismatic and he obviously felt I was a bit peculiar.
“I used to tease him by pretending I was earning huge fees. This made him pink up a bit. But he was the generation ahead of me so there was a gap too wide for us to become friends.
“But I respected him and greatly admired his Worzel Gummidge series. I was sorry to hear of his death although envious of the manner (he died in his sleep). He did not know the fear of dying”.