British Artist Jonathan Olley describes how his former job as a newspaper photojournalist lead him to discover the secret surveillance towers of Northern Ireland.



Jonathan Olley is a British artist and documentary photographer. His work, ‘Castles of Ulster ‘1981 is on display in Exposed: Voyeurism, Surveillance and the Camera at Tate Modern until 3 October 2010. Part of a series of Exposed interviews available for free on your mobile phone at Tate Modern: