The bread maker has split with the agency after 12 years.
Warburtons recently launched its biggest-ever on-pack promotion called the “Save Tons on Lunch” campaign which is running between June to September.
The on-pack promotion is appearing across a range of Warburtons core bread and roll products where consumers can win prizes worth over £20m of selected lunchtime food products.
The bread maker has linked up with other major brands including Birds Eye Fish Fingers, Heinz Snap Pots, Princes, Anchor Spreadable and Weight Watchers, with money-off coupons to be valid either against a Warburtons product or a product from a participating partner brand.
Warburtons says it is in the midst of compiling a shortlist for the account.
BBH led a major marketing campaign for the brand last October, promoting Warburtons as “Britain’s favourite baker”.