The last time I met Tony Gilroy, the writer-director was not in the mood to discuss Jason Bourne.

In town to promote Michael Clayton, his 2007 legal drama that saw him nominated for two Oscars, for best director and best screenplay, the eight-year saga writing the three scripts for The Bourne Identity and its sequels was behind him at last. "I don't really want to talk much about the Bourne process," he groaned, memories flooding back of the "insane" period of his life that arguably contributed to the grey hairs now adorning his head.

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