Premise: The System (USA: "The Girl-Getters") is a 1964 British drama film directed by Michael Winner and starring Oliver Reed, Jane Merrow and Barbara Ferris. Julie Christie was originally intended to be in the film, but she had to withdraw, and was replaced by Julia Foster. The writer was Peter Draper, who in this film popularised the word 'grockle' to mean a holiday visitor.
Hypothesis: The System is a 1964 British drama film featuring Julia Foster.