However, Duke is sorely provoked in a memorable scene, when Archer points out that the system brutalises not only the inmates but the wardens also, and that Duke remains only a basic officer despite his many years in the service.
A furious Duke, in hard denial, ends the conversation to reprimand Archer, putting him on report for insolence.
"Keep it moving! It's not sandcastles at Margate beach! Come on Archer, no slacking from you, ya long streak of cabbage!"
In the BBC screenplay, Duke is portrayed by Dennis Castle.
Castle plays Duke rather less curmudgeonly than Dean's version.