The saving, which equates to 34 tonnes of CO2, came after the company became a beta test site for Agfa's Energy Elite plate.
Group marketing manager Sharon D'Cruz described the saving as "staggering", leading to a reduction of the company's carbon footprint and "substantial bottom line contribution".
The company began testing the plates in 2007 before installing the Agfa Avalon N36 platesetter after Drupa last year, enabling them to totally adopt the Energy Elite plates across the board.
Pre-press manager Sean Coughlan said: "After three decades of baking, it was strange not to be using plates with what was effectively a stove-enamelled image, but the Energy Elite double-coating technology has been able to cope with all our run length demands without any problems."