My Lords, this method of preventing HIV is highly effective: one tablet taken a day has a success rate of 99%. The lifetime cost of treating one patient with HIV is more than £300,000. Are we not talking about a false economy here when we could prevent some 300 or more new cases a year and avoid the risk of these high-risk individuals passing on the HIV? This decision has been based on fundamental disputes about who should be funding it and not by the logic of successful treatment.