I guess the best blogs to write are the ones about subjects you don’t know the answer to. However, it always astounds me how many people can advise you on the answer about an important issue despite not knowing what the evidence actually says. So, when the recent British Medical Association conference voted on this issue (two thirds voted for the lowering of the age of screening to 20), my first thought was I would abstain, primarily due to lack of knowledge about the evidence-base on cervical cancer.