Dr Mark Porter investigates health issues of the day. He leads a debate on the programme of health checks for the over 40s recently announced by the government, including screening for heart disease, diabetes and stroke. Guests discuss the pros and cons of such preventative action and the lessons learned from 20 years of breast cancer screening. Mark investigates whether such programmes can increase or calm public anxiety and whether people are more or less likely to comply if they are concerned about their health.