In late April of this year, a Portuguese start-up, Sensei, raised $6.5 million to enable it to scale a technology that can help retail to compete with Amazon Go – autonomous stores whereby you can pick up grocery items and just walk out of the store, no checkout necessary. Michael Stothard, editor of the FT-backed publication on European start-ups Sifted.eu, tweeted that this technology will save each of us two years of our lives that we spend queueing in shops. Two years. This number and this tweet really stuck with me. And clearly, it still does, since I’m writing about…

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