Biografia

Trained at the Webber Douglas Academy of Dramatic Art in London, whose alumni include Antony Sher, Terence Stamp, Julia Ormond, Rupert Friend, Angela Lansbury, Daniel Hunt, Matthew Goode, Sue Johnston, Minnie Driver, Steven Berkoff and Julian Fellowes.

After his national service in the Royal Air Force, he worked as a steward with P&O, where he saved enough money to attend drama school.

By 1995, Treacher had requested to be written out of the series EastEnders, stating: "By the time I finished, even the sound of the theme music was making me feel ill. I felt depressed." He also stated in a 2003 BBC documentary interviewing past stars of the show that he felt "compelled" to leave with advancing age. He said the stress of a gruelling schedule working long hours on the show was affecting his health and that doctors told him that if he did not leave the job soon and relax it would kill him.

In a statement announcing his death, his family confirmed that Treacher's health had been deteriorating for some time.

In 2015, Treacher told the press that he suffered from ataxia, a degenerative disease that hinders balance and the ability to walk. Treacher said that as a result of this he had fully retired and he sometimes had to rely on a wheelchair for mobility. He also said that he no longer watched EastEnders, calling it "a load of old rubbish these days".