In the 1960s, Blakiston appeared in three episodes of "The Avengers" as well a number of ITC productions such as "The Saint", "Department S" and the 1969 "Randall and Hopkirk (Deceased)" episode "Never Trust a Ghost". She appeared to great acclaim as Marjorie Ferrar in the BBC Television adaptation of Galsworthy's "The Forsyte Saga" in 1967. In 1977 she appeared in "Raffles" as Lady Paulton, and also in "Murder Most English" as Helen Carobleat. In 1980/81, she starred in the BBC/Australian TV World War II comedy series " Private Schulz " as The Countess.