Liddle is known for his work on The Periodic Table of Videos, a series of videos from the University of Nottingham presented on YouTube, which feature educational vignettes on the periodic table.
He is executive producer for Chemistry at Manchester Explains Research Advances (CAMERA), a series of videos from the University of Manchester presented on YouTube, which feature videos explaining chemistry research papers published from the University of Manchester.
He is a National Co-ordinating Centre for Public Engagement Ambassador (2013–).