Matt Emmett’s image, Covered Reservoir, Finsbury Park, London, East London Water Works 1868, from which this detail is taken, beat 20,000 entries to win the fourth annual Arcaid Images
Architectural Photography Awards in 2016. Urban explorer Emmett says the explanation for his focus on ‘forgotten heritage’ sites, where the absence of lighting, if not light, is often a
defining feature, is that ‘there is a total lack of distraction in the stillness of a derelict building’. The East London Waterworks Company operated until 1904. Two years before it built the 5m
gallon ( 22.7m litre) covered reservoir under Finsbury Park almost 6000 Londoners died of cholera. The company was found guilty of supplying water from open reservoirs that had been
contaminated by dead eels found in water pipes. Also known as the Hornsey Wood Reservoir, its surface was used for lawn tennis until the first half of the 20th century.