As with most difficulties in life, the difficulties we have experienced in conceiving have brought benefits. We have reflected on what it means to us to have children, why we would like children and what life would be like for us without children. We have come to appreciate that it is a true privilege to have children. With your high success rates, you must be used to grateful couples thanking you. But I wanted to leave you in no doubt of the wonderful difference you have made to our lives (and presumably the lives of many others). Thank you so very much for all your advice and support.” (2009)