Dr. Lockie grew up in North London attending University College School in Hampstead, before training in Medicine at Edinburgh University. During this time he also undertook an intercalated BSc. Med. Sci. gaining First Class honours. After graduation with MBChB in 1999, he worked on the professorial medical and surgical wards at the Old Royal Infirmary in Edinburgh before moving to London for his specialist Cardiology training at St Thomas'.
With an interest in ischaemic heart disease and revascularisation he undertook a PhD at KCL, London, winning the Young Investigator Prize at the international SCMR conference in the United States, as well as presenting and publishing his work at other conferences around the world. He then spent a year at the Academic Medical Centre in Amsterdam on a British Heart Foundation training fellowship specialising in advanced stenting and percutaeous coronary interventions (PCI). He then completed his PCI training back at St. Thomas' under the supervision of Prof. Simon Redwood who is the current president of the British Coronary Intervention Society (BCIS). He now works as a consultant interventional cardiologist at the Royal Free London NHS Foundation Trust.