Aldi customers should keep an eye out for an easy-to-miss code that staff put on lots of products throughout the shop. This easily overlooked sign is used across every branch of the budget supermarket chain - and helps to spot major changes before they happen.

The retailer offers a vast range of items, mostly under its own budget-friendly brand, although not every product is guaranteed to remain on the shelves between shopping trips. Customers are used to the 'when it's gone, it's gone' appeal in the middle aisles, where the items on offer are swapped out every Thursday and Sunday.

But, store bosses also update products found in the main shopping areas every so often, reports the Mirror . This may happen for various reasons, including poor sales performance, the product itself bei

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