Inclusion Criteria:  Diagnosis of type 2 diabetes Elevated HbA1c Elevated BMI Preserved left ventricular ejection fraction  Exclusion Criteria:  Uncontrolled hypertension Contraindication to magnetic resonance scanning More than mild to moderate valvular heart disease Atrial fibrillation History of sustained ventricular tachycardia or cardiac arrest Clinically significant concurrent condition which could prevent the patient from performing any of the protocol-specified assessments, represent a safety concern if the patient participates in the trial or could confound trial assessments of safety or tolerability