Using Non-Invasive Mapping To Eliminate Structural Heart Disease Ventricular Tachycardia

Inclusion Criteria: * ≥18 years old * Patient with the following: * Evidence of post-myocardial infarction\* structural heart disease. * Cardiac CT and/or cardiac MRI scan performed within 6 months. * ICD/CRTD implantation. * Device therapy for VT: at least 1 appropriate ICD shock or 3 ATP episodes within a 6-month period. * Suitable candidate for VT ablation as per NHS standard of care. * Patient agrees to comply with study procedures and be available for routine follow up visits for at least 6 months after enrolment. Exclusion Criteria: * Lacks capacity to provide informed consent. * Presence of intramural thrombus, tumour or abnormality that precludes vascular access, catheter introduction or manipulations. * Coagulopathy, bleeding diathesis or suspected pro-coagulant state. * Sepsis, active systemic infection or fever (\>100.5 F/38 C) within a week prior to the ablation procedure. * Renal failure requiring dialysis or renal compromise that in the investigator's judgement would increase risk to the patient or deem the patient inappropriate to participate in the study. * Known allergies or intolerance to AADs to be used to treat PVCs. * Known allergy for contrast. * Female patients who are pregnant or breast feeding. * Enrolment in a concurrent interventional clinical study that in the judgement of the investigator would increase risk to the patient or deem them inappropriate to participate in this study. * Other conditions that may prevent patients from adhering to the study protocol, in the opinion of the investigator.