IGHE and vitamin D deficiency: These include insight into the prevalence of undiagnosed hypertension, Chronic Obstructive Pulmonary Disease (COPD) and diabetes; examination of the prevalence and risk factors for vitamin D deficiency, iron deficiency anaemia, physical inactivity, raised dust-mite specific IgE and raised cholesterol; and presentation of cotinine data to support policy action on second-hand tobacco smoke.