Appointed at University Hospital Southampton NHS Foundation Trust in 2013, Flett is a consultant cardiologist with a specialist interest in heart failure and cardiovascular magnetic resonance (CMR). During his heart failure training and research at University College London Hospital, he also trained in advanced pacemaker therapy (acquiring the Certified Cardiac Device Specialist accreditation) and cardiomyopathy at the Heart Hospital. He has published widely in CMR and cardiomyopathy related research. He is also a member of the Royal College of Physicians (UK).

Flett was awarded a British Heart Foundation clinical research training fellowship. He has a strong research record in cardiovascular magnetic resonance and cardiomyopathy, with a number of high impact publications, book chapters and prizes.

He completed MBBS at St George’s Hospital Medical School and MD (Res) from University College London.