 Her theatre work led to a role in the BBC "Sunday Night Theatre" production of "A Midsummer Night's Dream" in November 1958, in which she played Hermia.Soon afterwards, the director, Rudolph Cartier, cast her in the leading female role, Barbara Judd, in the science-fiction horror serial "Quatermass and the Pit" (1958–59).Finn's career as a film actress, other than providing voices for two films based on "Thunderbirds", did not develop further.