5 - foot long mural was on London store . Mural was point of pride for residents . Residents noticed mural was taken away last year . ` ` Slave ##s '' expected to cost more than $ 500,000 .
4-foot-by-5-foot Banksy mural was on London store . Mural was point of pride for locals . Residents noticed mural was taken away last week . `` Slave Labour '' expected to fetch more than $ 500,000 .