Bruce Boa was the difficult guest who wanted a waldorf salad in the classic “Fawlty Towers”.   He was born in 1930 in Calgary, Alberta, Canada but made his acting career in British films and television.   He became used as an American in British films.   Among his films are “The Omen”, “Full Metal Jacket” and “Return to Oz”.   He died in 2004.

IMDB entry:

Bruce Boa was born on July 10, 1930 in Calgary, Alberta, Canada. He was an actor, known for Full Metal Jacket (1987), Star Wars: Episode V – The Empire Strikes Back(1980) and The Omen (1976). He was married to Cherry. He died on April 17, 2004 in Surrey, England