From ‘the cloud’ to invisible beams carrying billions of dollars, our world can often feel like a neverland of terrifying tech. A new radio series is here to help

A couple of years ago, I took a bike ride from Slough, heading east – right through London and out the other side to Basildon. I was looking for two important but hidden locations: a data centre belonging to the London Stock Exchange, and another belonging to the New York Stock Exchange. To find them, I followed the line of microwave dishes that connect them – some perched on pylons, others on water towers or tall buildings. These beams of data carry millions of high-frequency financial transactions – and thus billions of pounds – through the air, above our heads, completely invisibly.

Near Heathrow airport, I looked up to see the microwaves passing through two huge dishes atop Hillingdon hospital, a pioneering 1960s centre now suffering – like much of the NHS – from a shortfall in funding. For a rent of a few thousand pounds a year, the machinery of private finance perches on the crumbling infrastructure of the welfare state: all that money, flowing invisibly just a few metres above the patients inside. This is how a difference in visibility translates into a difference in power: those who can see, can understand – and thus shape the world to their advantage.