Career
Swanwick"s film career began with bit parts in films such as The African Queen (1951), and he became a recognisable face on British television during the mid-1960s when he featured in a number of series, including The Avengers and Danger Manitoba where he first worked with later Prisoner star and co-creator, Patrick McGoohan. According to several biographies Swanwick endured major health problems in the 1960s that resulted in him undergoing undisclosed operations that left him with a short time to live. Swanwick played the non-singing part of Herr Zeller in the original London stage production of The Sound Of Music.
Circumstantial Evidence.