Inclusion Criteria:  History of cancer > 10 years ago Have received potentially toxic chemotherapy Anthracycline (any dose) Trastuzumab (Herceptin) in breast-cancer with the HER2 mutation OR Tyrosine kinase inhibitors (e.g. sunitinib) OR Left chest radiotherapy  Exclusion Criteria:  Ejection fraction at baseline echo <50% Valvular stenosis or regurgitation of >moderate severity History of previous heart failure (baseline New York Heart Association (NYHA) classification >2) Systolic BP <110 mmHg Pulse <60/minute if not on beta blocker Inability to acquire interpretable images (identified from baseline echo) Contraindications to beta blockers or angiotensin-converting enzyme inhibitors Oncologic (or other) life expectancy <12 months or any other medical condition (including pregnancy) that results in the belief (deemed by the Chief Investigators) that it is not appropriate for the patient to participate in this trial Already taking both angiotensin converting enzyme inhibitors/angiotensin receptor blockers and beta blockers, or intolerance (or allergy) to both. Unable to provide written informed consent to participate in this study