Dr Gratwicke studied medicine at the University of Oxford and was awarded a scholarship at his college, Oriel College, for attaining distinctions in examinations in neurosciences and pathology. He completed his postgraduate training in neurology at King's College Hospital, Guy's & St Thomas' Hospitals, St George's University Hospital and The National Hospital for Neurology & Neurosurgery, Queen Square, all in London, UK.

He completed his PhD in Clinical Neurology at the University College London Institute of Neurology in 2018. His research interest is in development of novel therapeutics for Parkinson's disease and other neurodegenerative conditions.

He is a full-time Consultant Neurologist in the NHS in the UK, holding substantive posts at both St George's University Hospital in London, and Frimley Park Hospital in Surrey. He consults on the breadth of general neurological problems such as headaches and seizures and has subspecialist expertise in the management of Parkinson's disease, tremors, movement disorders and neurodegenerative conditions.