A decision to suspend the alcohol licence of a Tesco store in Sussex has been upheld after the supermarket chain appealed against the original ruling.
Three Tesco stores in Sussex had their licences suspended
The ban will run for 28 days from 2 July, and follows a police operation in which alcohol was sold to under-18s at the Tesco Express outlet in Worthing.
The test purchases were carried out at the store in Broadwater Street in October last year.
Police said there had been "flagrant failings" in Tesco's licensing role.
The two underage sales which were observed by police last October followed a similar undercover operation by Trading Standards in April 2006.
Two more appeals
Sussex Police applied to Worthing Borough Council for a formal review of the conditions of the store's licence.
The council then ruled in January that the licence should be temporarily suspended.
Tesco's appeal was rejected at Worthing Magistrates' Court on Monday.
Jean Irving, licensing and public safety manager for Sussex Police, said: "The test purchase operations confirmed how easy it was for a youngster to buy alcohol from this store."
Two other Tesco Express shops - in Downland Drive and Dobbins Place, Crawley - also failed the undercover tests.
Appeals against their licence suspensions by Crawley Borough Council are due to be heard on 9 and 16 July.
Tesco previously said: "We take the sale of alcohol to underage people extremely seriously and continue to dedicate substantial resources to improving our 'Think 21' procedures."