Bayliss was born in Kingston upon Thames and trained at the Italia Conti Academy and the John Gielgud Company. More than six feet tall, with a voice to match, he supplemented it with a barrage of wheezings, croakings, mutterings and, as the opera singer in Frontiers of Farce (Old Vic, 1977), garglings.
In 1956 he appeared on stage in “The Matchmaker” at the Royale Theatre in New York and in 1960 he appeared in “Ross” at the Royal Haymarket Theatre in London. His 20 films ranged from The Red Shoes (1948) to Darling (1965). He acted in more than 40 television productions including Please Sir!, The Sweeney, Coronation Street, Lovejoy and The Bill, plus dramas like Bye, Bye Columbus (1990), Merlin (1998) and The Arabian Nights (1999).
On radio he was particularly good in Jacobean adaptations, playing characters with names such as Sir Moth-Interest and Walter Whorehound. He appeared in more than 100 theater productions.