The supermarkets - in Crawley and Worthing, West Sussex - were caught selling alcopops to 15-year-olds in an undercover police investigation.
A Tesco spokesperson said: 'We take the sale of alcohol to underage people extremely seriously and continue to dedicate substantial resource to improving our Think 21 procedures and supporting our staff in tackling underage sales. We are disappointed with this decision and are considering our options.'
A recent survey analysing hospital admissions data, revealed record numbers of pre-teens and teenagers now require medical treatment for drink-related disorders.
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