He first came to America to run the joint venture between The New York Times and ITV Granada, winning a News and Documentary Emmy for a program for NOVA about bioterrorism.
Along with producer Ian McBride and researcher Eamon O’Connor, the resulting series of programs eventually led to the release of the six men and the establishment of a Royal Commission on Criminal Justice.
[3] Another controversial investigation, with journalist Tony Watson, exposed the activities of the Economic League, a privately financed organization set up to stop ‘subversives’ working in industry.
In 1990 Tremayne became Editor of Regional Features for Granada before becoming an Executive Producer overseeing the long running daytime series, This Morning.
In this period, working with editor Steve Boulton, World in Action had one of its most well known investigations looking into the financial affairs of Defense Minister, Jonathan Aitken.
Granada was successful for winning the competitive tender for its replacement, Britain’s first news magazine show, Tonight with Trevor McDonald.
Tremayne worked with editor Jeff Anderson to launch the series, which debuted with a controversial interview obtained by journalist Martin Bashir with the five men suspected of the Stephen Lawrence murder.
In 2002, when the joint venture came to an end, Tremayne became Executive Vice President for Granada America, whose New York production office made hundreds of hours of programming for American cable channels.
With Jeff Vanderwal he developed and oversaw the award-winning Believe Me: The Abduction of Lisa McVey[9] and the domestic violence expose I Was Lorena Bobbitt.