I saw him thousand years ago in Joe Egg with Zena Walker as the mother. She rightfully won a Tony, but he should have too. Right now, I cannot remember who beat him, so it may have been too much of a great thing that season.
I also saw him in London a couple of times, once in a play by Michael Frain (sic?). He was great in that also...actually don't remember anything about the other show, so it must have been forgettable.
I always wondered why he did not do more films...was he frequently on stage (clearly not so on this side of the ocean)? Very choosy? etc. I thought he would have been a bigger star if he had been more visible.
One of my all time favorite romantic movies is Two For The Road, in which he starred alongside Audrey Hepburn. Both were beyond terrific.,pure charisma, Hepburn glamorous no matter what she wore, him so handsome and charming when his character wanted to be. In its day, 1967, it was pretty ahead of its time, with scenes taking place in many different time periods (generally identified by the car they were driving), out an any semblance of chronological order.