What happens when the sperm or egg donor you choose isn't the one you get? Northern Cyprus is a sun-soaked haven for affordable IVF. But behind the glossy clinic websites, parents are discovering their chosen sperm or egg donors might not have been used. A BBC investigation follows parents searching for answers and children wondering where they have come from. Details of organisations offering information and support with infertility are available on the Pregnancy related issues page at bbc.co.uk/actionline.