Individuals who agree to participate will be randomly assigned into two groups. One group will be given the active drug whereas the other will have a placebo. Subjects in the study will all have a cardiac magnetic resonance (CMR) scan before treatment, at 1 year and then 2 years at the end of the treatment. Each scan will involve imaging the carotid arteries in the neck, the arteries in the arm and also the heart. Individuals will continue to have regular out-patient reviews by their own team of doctors, regular blood tests will be taken to monitor the disease and also to ensure the safety and well being of the individual.