Any attempt to describe a "best health service' must make political assumptions. For example, should it help everyone? Do different people have different entitlements to its support? Should its help be offered according to need, value for money or ability to benefit? These assumptions are not always clear to health service decision-makers immersed in clinical and economic technicalities, so HCA invited two philosophers --John Shand and David Seedhouse -- to engage in conversation about the political philosophy of health care.