At least in part, this programme seems to have been devised in order for Caroline Aherne to make scornful or sarcastic remarks to celebrities whom she dislikes, with Aherne in the guise of an old woman to supposedly take the sting out of her comments.
Such a concept barely merits a single programme, let alone a series, hence it's unclear why the BBC let it run for so long, although it's hardly the first time the Corporation has given the go-ahead to a series of dubious quality. With regard to one of the guests on the show, and as has been documented elsewhere, Aherne asked Debbie McGee what attracted her to her millionaire husband Paul Daniels.
It would have been interesting to see how Aherne reacted if McGee had turned the tables on her by asking Aherne what attracted her to her former husband, the wealthy rock star Peter Hook. I suspect Aherne would've been none too pleased. All in all, a rather unpleasant little programme.