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. For File on 4 Investigates Anna Collinson follows parents searching for answers and children wondering where they have come from.

File on 4 Investigates Sunshine & Secrets: The hidden side of IVF

Producer: Jo Adnitt Executive Producer: Rob Brown Technical Producer: Nicky Edwards Production Co-ordinator: Tim Fernley Editor: Tara McDermott

Details of organisations offering information and support with infertility are available on the Pregnancy related issues page at bbc.co.uk/actionline.