Patients will be prospectively enrolled whilst attending for elective coronary CT (computed tomography) angiography including a coronary calcium score, at the Royal Surrey County Hospital. Data regarding demographic and clinical characteristics of patients will be collected. Peripheral venous blood sampling will take place on this occasion. Coronary artery calcification scores will be estimated by a Radiologist using default software. Patients eligible for the bone metabolism substudy will be required to attend the University of Surrey for peripheral Quantitative Computed Tomography (pQCT) of bone mineral composition of the radius. In the intervening period we will ask them to complete a 4-day food diary and wear a UV dosimeter, the latter to assess typical UV exposure, for one week.
