His early plays led to him being considered one of the leading British exponents of the Theatre of the Absurd.
His play Next Time I'll Sing To You, written in 1962, was staged in the West End starring Michael Caine, Barry Foster and Liz Fraser, at the New Arts and the Criterion Theatre in 1963.
In 1975 he completed John Vanbrugh's four-act fragment, A Journey to London, a play that had been sentimentalised by Colley Cibber in 1728 as The Provoked Husband.
Saunders' version was first staged in Greenwich and successfully revived at the Orange Tree Theatre in 1986.
Bodies, commissioned and first staged by Sam Walters at the Orange Tree in 1977, was revived by Robin Lefévre at the Hampstead Theatre in February 1978, and given a West End transfer in April 1979, starring Dinsdale Landen, Gwen Watford, David Burke and Angela Down.