[1] Knocker revolves around the unfortunate tale of Ian Dunn, who works as the sole surviving market researcher for International Query Board UK.
His position as the only member of the Board who actually goes out of the office to canvas the opinions of the public is not surprising, considering what has to put up with on a day-to-day basis.
While not sorting out Ian's problems, Mary usually tries to solve those of Andre, a character who never appears, but is constantly referred to as someone who is accident prone.
Phil Daoust from The Guardian chose the series as his "Pick of the Day" saying, "Elsewhere, Knocker (11.15pm, BBC7) is having a few laughs at the expense of market researchers.
Ian Dunn (Neil Edmond) is the International Query Board UK's longest-serving door-to-door interviewer, spreading a little irritation everywhere he goes with his broken clipboard and inappropriate footwear.