John Cleese
It was John Cleese
I believe you are referring to Basil Fawlty. Basil was played by John Cleese. John was a member of Monty Python and continues to be a popular actor and comedian, having a part as Nearly Headless Nick in the Harry Potter movies.
John Cleese plays Basil Fawlty in Fawlty Towers.
The sitcom was Love Thy Neighbour and the character was Jacko who was played by Keith Marsh.
The answer is Dermot Mulroney :)
Lisa Kudrow
Debra Messing
Polly Holliday played Flo on the sitcom Alice. She later appeared in the short-lived spinoff "Flo."
Candice Bergen played Murphy Brown in the CBS TV sitcom.
Dr. John "JD" Dorian was played by Zach Braff
John Larroquette
Lee Horsley