In 1992, she left the staff of the BBC to take up a position as a drama script editor at Carlton Television, working for Tracy Hofman, the controller of drama. Carlton had won the ITV network franchise for broadcasting in London on weekdays, and planned to produce dramas for national consumption across the entire network. At Carlton, Tranter oversaw the Timothy Spall comedy-drama "Frank Stubbs Promotes" and the Victorian-era medical drama "Bramwell", both of which became successful and popular hits for ITV.