It's not the people inside you have to worry about it's the friends and neighbours who are driving past on their way to Tesco that might recognise you and tell everyone that you've been seen entering an Aldi !
I'll give you a tip before your adventure ....you'd better have your card or cash in your hand and ready when you get to the till because the cashiers are trained to work at warp speed, your shopping will come off the end at the speed of sound .... and don't even THINK about trying to pack you shopping into a bag at the cash desk .... rent a trolley and hurl you stuff into it then pack your stuff away from the cash desk !