The Aldi Shop&Go concept store in Greenwich, south-east London, opened at 7am this morning for public testing, having been tested by Aldi colleagues in recent months.

The German discount supermarket’s new shop will also allow customers to buy alcohol, using facial age-estimation technology to check whether they appear to be over the age of 25.

The move follows in the footsteps of such rivals as Amazon and Tesco, who have both opened similar checkout-free stores.

Aldi staff will use a series of high-tech cameras to follow customers as they do their shopping and then bill them when they leave. Aldi has been trialling the store with employees over the past few months.

Customers must first register with Aldi’s Shop&Go app, which will then allow them to enter the store, pick up their items and walk out. The aim is to end long queues in stores and ultimately could lead to more such sites opening.

Aldi said customers wishing to purchase alcohol will...