she first appears when she begins renting a flat from terry and janine butcher's (charlie brooks) letting agency. terry and margaret are attracted to each other and a relationship soon develops. janine and margaret do not get along, which makes things awkward for terry as he and janine live together. janine grows extremely jealous of margaret and terry's relationship, and she plays various tricks to split them up. margaret is not perturbed and vows to beat janine at her own game, leading to numerous squabbles. when janine discovers a photo of margaret and another man, she immediately assumes the worst and informs terry that margaret is cheating on him. margaret explains that the man in the photo is her brother, david walker (michael fenner) who is dying of cancer and she is paying for his placement in a drug trial in america.