Shoppers probably don’t think much about what happens next when they place an online grocery order.

But it sets-off an intricate dance of software, artificial intelligence, robots, vans and workers.

At an Ocado warehouse just outside Luton, I’m in the middle of such a dance.

As far as I can see, hundreds of robots whizz around a grid, fetching items for online orders. They move with dizzying speed and precision.

In the early days of online shopping, when you placed an order, humans would dash around a warehouse or a store collecting your items.

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