Having made her debut as a pianist on BBC radio show The Children's Hour at the age of 13, Hutchinson has gone on to balance a career as a solo performer on England's club circuit and appearances in musical theater productions. She appeared in a 1962 revival of Finian's Rainbow in Liverpool and has appeared in such London productions as No Strings, Cowardly Custard, Bubbling Brown Sugar, and The Wiz. She made her Broadway debut in the 1985 production Goes to Hollywood, featuring music by Jerome Kern. She toured with actor/singer Paul Jones in Let's Do It, celebrating the 100th birthday of Cole Porter, in 1991. Reuniting with Jones two years later, she appeared in a series of concerts, Hooray for Hollywood, that featured songs from Porgy & Bess, Annie Get Your Gun, and Top Hat.
A member of her father's band, while still in high school Delmar performed at United States Air Force bases in England throughout the late '50s. She was touring with the group when her father died in a fatal auto accident in 1959.