It's possible you're thinking of one of these:
* "The Guardian" newspaper: The Guardian is a well-known British newspaper, but it doesn't have its own dedicated TV programme.
* TV shows featuring "The Guardian": There have been several TV shows that feature "The Guardian" in some way, like "The Guardian" (2001-2004), a drama based on the newspaper, or "The Guardian" (1990-1991), a TV show about a newspaper.
If you could provide more details about the programme you're thinking of, I can help you find out why it was cancelled. For example:
* What year did the programme air?
* What was the genre of the programme?
* Do you remember any specific details about the programme?
Please let me know, and I'll try my best to help!