In addition to his theatre writing, Wilcox edited five volumes of Gay Plays for Methuen, who also published his autobiographical journal of 1989, Outlaw in the Hills.
His monograph "Benjamin Britten's Operas" was published by Absolute Press in 1997 and was shortlisted by the Royal Philharmonic Society for its music book of the year award.
For Opera North, he worked with Jeremy Sams on a new libretto for Chabrier's Le roi malgré lui that was first staged at the Edinburgh International Festival as The Reluctant King in 1995.
His television dramas include episodes of Crown Court and Cluedo, Cricket (BBC TV : Plays for Tomorrow:1981), Accounts (C4 : Film on Four:1982), Lent (BBC TV : 1985 : Pye and TRICS awards for best script of the year), Inspector Morse : Last Bus to Woodstock (1988) and Doctor Finlay : Winning the Peace (STV : 1993).
His play, Betty and Maud (2010), had its world premiere in the middle of the Pacific Ocean on board a Saga cruise liner.