Waugh's early novels, especially Vile Bodies, are notable for a "cinematic" style of pacing, with relatively short segments of narrative being "cross-cut" to build tension.
It's noted in his Wikipedia entry that he spent time in Hollywood trying to get a film production of Brideshead Revisted made, but it's unclear from the article whether he was there merely in the capacity of the owner of the rights, or actually working as a writer for the studio.
Did Waugh write any screenplays, either working for a studio or on his own?