Patrick Macnee did a lot of radio works too, especially in the 50s in Canada.
Sadly, the archives, websites and print media about his Canadian radio works mainly do not list the roles performed by the actors.
There also exists at least one photo in the CBC Archive that shows Macnee at a radio production from Ford Theatre in 1952, maybe from the play Richard II.
A list of Patrick Macnee's radio work in the United Kingdom and in Canada can be found on The World of Patrick Macnee, an unofficial hompage about the actor