Beverly Hillbillies

The Beverly Hillbillies were planned to be reported on in a "new comic for girls", which would be edited by Lady Penelope Creighton-Ward. (PROSE: Time Barrier Busted)

Behind the scenes
The "Beverly Hillbillies" were the titular characters in The Beverly Hillbillies, which had a UK-exclusive comic spinoff in the mid-1960s. The family consisted of Jed Clampett, his daughter Elly May Clampett, her maternal grandmother "Granny" Moses, Elly's cousin Jethro Bodine, and Jethro's mother Pearl Bodine.

Time Barrier Busted mentions that Lady Penelope will report on "Beverly Hillbillies", implying that the Clampetts exist within the Doctor Who universe as real people.