The mystery behind the lightning-fast checkout speed at Aldi supermarkets has been unveiled. Keeping pace with the swift staff at the German-owned supermarket can prove a nerve-wracking experience. A quick trawl through Facebook and Twitter reveals countless humorous posts about the breakneck speed of the checkout assistants. There's even an Aldi Checkout Challenge page where customers share their tales of attempting to rein in an overly zealous till operator, according to The Chronicle. One

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