Departures at Solent local TV chanel
According to local newspaper, the Daily Echo, Ms Rantzen blamed commitments to other organisations and her charity work for the move.
The paper described the departure as "a major blow for the station as hopes were pinned on the Hampshire-based television personality to give That's Solent a chance to reach audiences on screens across the south", reporting allegations that there had been a complaint to the National Union of Journalists over pay, although Ms Rantzen said the reason for her departure "was not related".
Mary McAnally, a former Managing Director at Meridian TV, hasn't publicly commented on her departure.
The involvement of Esther Rantzen and Mary McAnally on the channel featured prominently in That's Solent's application for an Ofcom local TV licence.
Chief executive Daniel Cass confirmed that the departures would not affect the day-to-day running of the local channel, which broadcasts from the Isle of Wight's Rowridge transmitter and appears on Freeview channel 8, as well as via local cable TV.