Sylvia Kay

Sylvia Margaret Kay was an English character actress who had many roles in British television programmes, most notably as Daphne Warrender in the BBC sitcom Just Good Friends.

Wake in Fright
Coming Out of the Ice
That Kind of Girl

The Avengers · S6, E4

You'll Catch Your Death

Empty envelopes are delivered to top Government officials, who are then found dead. The only clue is that each man seems to have died from a fit of sneezing.