The agency has been taken on by Clippy McKenna, who is in dispute with the EU over her products.
McKenna, who runs Clippy’s Apples and started the business in her Cheshire kitchen four years ago, has been told she cannot use the term jam because of a lack of sugar content in the spread.
Her products are sold in 800 Tesco stores nationwide, as well as Harvey Nichols and other outlets.
She has brought in Citypress following a series of chemistry meetings, on what is initially a project brief but may develop into a longer term arrangement.
The ruling has come about because the Bramley Apple-based product is not ruled to have enough sugar in it.
Charles Tattersall, MD of Citypress, said that there were plans to canvass public opinion before launching a petition against what he called a ‘mad’ law.
‘We will be doing product placement work and spreading the message in the media before moving into a more public affairs role.’
He added: ‘We also want to raise Clippy’s personal profile, telling the story of how she started her business and positioning her as a kitchen entrepreneur.’