Pepsi owns a 10% stake in Britvic and, according to reports, pushed for the change on the account.
WPP Group-owned Berlin Cameron/Red Cell won the Coke Classic account in the US in February, prising the business away from Interpublic's McCann-Erickson after creating the latest ad campaign called "real", starring celebrities including Penelope Cruz.
HHCL/Red Cell, which was acquired by WPP in January, does not currently do any work for Coca-Cola in the UK. In March, it was revealed that Coca-Cola planned to run US advertising in the UK after local roster agencies Mother and McCann-Erickson failed to crack the Coke brief.
HHCL/Red Cell worked on the launch of Tango for Britvic, creating a series of celebrated and attention-grabbing ads until it lost the account to Clemmow Hornby Inge in February 2002.
The agency has stemmed a series of account losses including Tango and internet bank Egg last year, winning a place on the Sky advertising roster.
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