ACB - formerly Christow - has seen off two reviews in the past nine years, and is up against at least three agencies to keep the £80,000 brief.
The trust employs 1,600 people and is bidding for Foundation Trust status, which would give it more autonomy and independence. Part of the brief will include communicating the fact that on gaining foundation status, all employees will become members and have a bigger role to play in the hospital's governance.
The Government wants all hospitals to have foundation status by 2008.
Foundation trusts can decide their own priorities and have new powers in terms of how to raise money. They are governed locally and the management structure includes a membership board.
Pitches take place on 7 September, with the brief spanning internal and external comms. The agency will report to head of corporate affairs Jane Brennan and chairman Sue Ellen.