It appears they are not all in on it.
'Cunk is not real, of course. She is played by Bolton-born comedian Diane Morgan. Although many of the people she interviews in her series are not aware of this, as she explains between sips of water. “They are just told they are being interviewed for a BBC history documentary, I think. They are quite flattered and are keen to explain their area of expertise. We are not taking the *** out of them, but it’s nice to see them struggling and having to recalibrate their ideas.”'