A minute before midnight on 21 July 2021, as passengers staggered sleepily through Manchester airport, I stood wringing my hands in the glow of a vending machine that was seven feet tall, conspicuously branded with the name of its owner – BRODERICK – and positioned like a clever trap between arrivals and the taxi rank. Standard agonies. Sweet or savoury? Liquid or something to munch? I opted for Doritos, keying in a three-digit code and touching my card to the reader so that the packet moved jerkily forwards, propelled by a churning plastic spiral and tipped into the well of the machine. My Doritos landed with a thwap, a sound that always brings relief to the vending enthusiast, because there hasn’t been a mechanical miscue. Judged by the clock, which now read 12am, it was the UK’s first vending-machine sale of the day.