Tesco has been told to stop using its Clubcard Prices logo after losing a long legal battle with rival Lidl.
The German discounter had argued the Clubcard logo of a yellow circle on a blue square infringed its copyright, and took "unfair advantage" of its "reputation for great value."
Last year the High Court found in favour of Lidl and on Tuesday the Court of Appeal agreed.
Lidl said it was "delighted", while Tesco said it was "disappointed".
Customers can expect to see a change to its Clubcard Prices logo in the coming weeks.
The legal saga between the two supermarkets began in 2020 when Lidl launched the lawsuit against Tesco after it started using the distinctive logo for its Clubcard scheme.
Lidl argued Tesco had deliberately copied its trademark to deceive customers into thinking its prices were comparable.
In a statement issued after Tuesday's ruling by the Court of Appeal, Lidl said that Tesco had "prolonged the dispute... deceiving customers for another year".
"We are delighted to see that the Court of Appeal has now agreed with the High Court that Tesco's use of its Clubcard logo is unlawful.
"We expect Tesco now to respect the Court's decision and change its Clubcard logo to one that is not designed to look like ours," it said.
Meanwhile, Tesco moved to reassure its customers and said it was "consistently the cheapest full-line grocer".
"We are disappointed with the judgement relating to the colour and shape of the Clubcard Prices logo but would like to reassure customers that it will in no way impact our Clubcard Prices programme.
"Clubcard Prices, irrespective of its logo, will continue to play a central role in rewarding our Clubcard members with thousands of deals every week," it said in a statement to the OceanNewsUK.
