Chronic stable angina is a common manifestation of ischaemic heart disease. Current mechanical therapies (percutaneous coronary intervention and coronary artery bypass grafting) and pharmacological therapies (nitrates, calcium channel blockers, betablockers and potassium channel activators) main actions are to treat the end product of ischaemic heart disease on chronic stable angina, i.e. the flow limiting stenosis. We postulate that by treating insulin resistance, an upstream factor in the pathogenesis of ischaemic heart disease, we will improve angina by in turn improving endothelial function. We will attempt to demonstrate this by way of full bruce protocol exercise tolerance test, Seattle Angina Questionnaire and 24 hour ST segment analysis before and after treatment with the insulin sensitiser rosiglitazone for three months.