Also in this film are Ron Moody (who turned down a chance to play Doctor Who to his later regret), Jenny Agutter (who, among many other roles, was in Logan's Run and An American Werewolf in London, and was Councilwoman Hawley in the 1st Avengers film and in the 2nd Captain America movie), Flora Robson (whose film career began in 1931 and whose parts included Queen Elizabeth in the 1940 Sea Hawk, Sister Philippa in Black Narcissus, the Queen of Hearts in the 1972 Alice's Adventures in Wonderland, and a Stygian Witch in her last film -the 1981 Clash of the Titans), David Tomlinson (maybe best known as George Banks in Mary Poppins, and Judy Geeson (who was in 2 episodes of Star Trek: Voyager).
What a fun cast!
This is not bad at all, which I think is pretty high praise for a low-budget 1970's era horror film. There's no violence, no gore, no jump scenes; and yet it maintains interest and develops the plot and characters nicely. The music is appropriate and adds to the film throughout.
HorrorNews.net closes by saying, "the cast delivers fair performances, yet it feels like the sum of its parts have been thrown into a hole."