Gillett is active in the Theatre Royal at Bath with the Peter Hall Company in numerous productions of Shakespearean plays and other classics, including Antony and Cleopatra, As You Like It, and at The Old Vic in The Tempest.
He also appeared in Noël Coward's Blithe Spirit, and Private Lives, and in George Bernard Shaw's Man and Superman and The Doctor's Dilemma.
[3] On television, he appeared as Robin Hood in Ivanhoe and as Peter Townsend, Princess Margaret's forbidden love, in The Queen's Sister.
He also appeared in Harry Enfield's Television Programme and as Charles Garner in episode 8 series 2 of Lovejoy first broadcast on 24 February 1991.
The documentary discusses the suspect who exposed the location of the Frank Family to the gestapo's in accordance from evidence found by author Carol Ann Lee.