No city can survive without water, and lots of it. Today we take the stuff for granted: turn a tap and it gushes out. But it wasn’t always so. For centuries London, one of the largest and richest cities in the world, struggled to supply its citizens with reliable, clean water. In The Mercenary River: Private Greed, Public Good--A History of London's Water (Headline, 2022), Nick Higham tells the story of that struggle from the middle ages to the present day.

Based on new research, Higham tells a tale of remarkable technological, scientific and organisational breakthroughs; but also a story of greed and complacency, high finance and low politics. Among the breakthroughs was the picturesque New River, neither new nor a river but a state of the art aqueduct completed in 1613 and still part of London’s water supply: the company that built it was one of the very first modern business corporations, and also one of the most profitable. London water companies were early adopters of steam power for their pumps. And Chelsea Waterworks was the first in the world to filter the water it supplied its customers: the same technique is still used to purify two-thirds of London’s drinking water. But for much of London’s history water had to be rationed, and the book also chronicles our changing relationship with water and the way we use it.

This interview was conducted by Dr. Miranda Melcher whose doctoral work focused on post-conflict military integration, understanding treaty negotiation and implementation in civil war contexts, with qualitative analysis of the Angolan and Mozambican civil wars.

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