Human Fertilisation and Embryology

The hon. Gentleman is absolutely right, which is why I began by expressing the humility I feel on this subject as a result of meeting and having had a lengthy conversation with a family who face just that issue. I remind myself, however, that we are dealing here not with a cure for those who have already been born, but with ensuring that those who are subsequently born do not suffer from that disease. If we were discussing a cure for those already living, perhaps the circumstances might be different.