I mentioned seeing seeing Jon Pertwee as the Doctor on stage in Oxford. That was on 30 May 1989. A little research shows the title of the production was Doctor Who — The Ultimate Adventure, and that the appearances at the Apollo Theatre in Oxford were the last week Pertwee appeared; six days after I saw the show, Colin Baker took over the role for the remainder of the run.
I’ve finished watching Season 11, Pertwee’s last. Onward to Tom Baker.