Camilla Richardson

 and her brother Godfrey were tenants of a timeshare run by Holiday Opportunity Promotions. Their time slot was the last week in October. In 1929, Godfrey was recovering from bronchitis, so he and Camilla decided to stay another week, since the owner of that time slot, the Doctor, never used it. When the Sixth Doctor and Peri showed up for his week and paid for his time, Godfrey explained that he had already paid as well. This caused a temporal leak in the system and the appearances of several other timeshare users from different time periods, which Camilla though were ghosts. The Doctor sent Godfrey and Camilla away in an ambulance. (PROSE: Timeshare)