beer is booming at discount supermarket chain aldi which increased its share of the premium ale market , but it 's believed aldi is luring customers away from tesco , offering a smaller range but cheaper prices .
another chapter in the rise of discounters who are slowly stealing market share from the big three , tesco , sainsbury 's and asda .
other research , also by kantar , showed that aldi overtook waitrose as britain 's sixth biggest supermarket its performance in the first three months of 2015 .