High Quality Content by WIKIPEDIA articles! The Tesco bomb campaign was an attempted extortion against British supermarket chain Tesco which started in Bournemouth, Dorset, in August 2000 and led to one of the largest and most secretive operations ever undertaken by Dorset Police. During the campaign, a blackmailer identified by the pseudonym "Sally" sent letters to Tesco stores threatening to harm customers if his demands—for Clubcards, modified so that the holder could withdraw cash from automated teller machines—were not met.