Viewing figures for the series were high, with 10.4 million people watching the final episode live.
Trojan is an alternative name for SCO19, the Metropolitan Police Service's (MPS) Specialist Firearms Unit.
Matt Stokoe (Luke Aitkens) & Sophie Rundle (Vicky Budd) also worked together on Jamestown (2017) as James Read & Alice Sharrow respectively.
Nicholas Gleaves (Roger Penhaligon) & Richard Riddell (Tom Fenton) also worked together on Castles in the Air (2013) as Tim Hopkins & Robert Doran respectively.