According to Rodney Huddleston and Geoffrey Pullum, that is not a relative pronoun but a subordinator, and its analysis requires a relativized symbol R: "The film that I needed R is not obtainable," where R is the covert object of "needed" and has "the film" as an antecedent.
He worked with Michael Halliday as research assistant on two projects at University College London: on the grammar of scientific English with Rodney Huddleston (1964–1967), and on Linguistics and English Teaching (1967–1970).
Huddleston is the primary author of The Cambridge Grammar of the English Language (ISBN 0-521-43146-8), which presents a comprehensive descriptive grammar of English.
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