Critics were concerned that the BBC had invested too much creative power in one person, and following Tranter's move to the United States, the position of controller of fiction was abolished and the responsibilities divided up among four other executives.

Two years later, she made the switch into television, working as a floor manager on dramas such as EastEnders and Bergerac.

Later that same year she was promoted to assistant script editor, working on the BBC's popular medical drama Casualty.

At Carlton, Tranter oversaw the Timothy Spall comedy-drama Frank Stubbs Promotes and the Victorian-era medical drama Bramwell, both of which were hits for ITV.

She began her new job as executive vice-president of programming and production at BBC Worldwide's Los Angeles base on 1 January 2009.

[6] In the summer of 2015, Tranter set up a production company with Julie Gardner based in Cardiff, Wales and Los Angeles, California.