Hylda Baker had a number of "Cynthias" throughout her stage and TV comedy career.
Hylda considered Cynthia a �prop�. Replaceable. Disposable. Unimportant. Hylda fired Cynthias after just one mistake. No second chance, no forgiveness. No pay cheque either! If a Cynthia missed a cue, walked too quickly, or, heaven help him, smiled� it�s over.
The 1957 TV series "Be Soon" lists Cynthia being played by Guy Middleton...
http://uk.imdb.com/title/tt0491596/
although another article claims it was David Kirk...
http://archive.thenorthernecho.co.uk/2000/10/1 9/189219.html