Geneticist Professor Turi King shares her views on donor anonymity in response to the HFEA (Human Fertilisation & Embryology Authority) opening a consultation on UK fertility law.

As well as having the ability to reveal our ancestry, one of the biggest surprises that comes from DNA testing, is the discovery of unknown family members. 62-year-old Janet had always wondered if analysing her DNA might reveal a mystery from her father's past.

Nearly 1 in 12 children, in the 1970s, were raised by a single parent. 52-year-old Richard has always wanted to know the identity of his father and wondered if testing his DNA could finally give him some answers. He appeared on series two of DNA Family Secrets and in this podcast Professor Turi King catches up with him, a year after the programme was broadcast, to see what's happened since.

Like over a million of us in the UK, 38-year-old Clare had never met her father. She was told he was a British soldier stationed in Northern Ireland, during the troubles. She featured on series 2 of DNA Family Secrets, hoping to find out if this story her mother told her was true.

Triplets, David, Philip, and Peter were adopted when they were four years old and had never known the identity of their birth father. They hoped appearing on DNA Family Secrets and having their DNA analysed could solve the mystery of their ethnicity.

Professor Turi King catches up with Peter, 2 years after they filmed the episode, to see what happen after the show aired.

Janine has lived her entire life never knowing the identity or heritage of her birth father. Her white British mum always kept her true parentage a secret. Professor Turi King catches up on what happened after Janine appeared on the first series of DNA Family Secrets.

Professor Turi King discusses the history of Sudeley Castle with it's archivist, Derek Maddock.

Sudeley Castle remains the only private castle in England to have a queen buried within the grounds - Queen Katherine Parr, the last and surviving wife of King Henry VIII – who lived and died in the castle.

Over 45,000 people in the UK are conceived through sperm donors. 25-year-old Tink, only found out as a teenager that she is one of them. Tink came to DNA Family Secrets because she wanted to test her DNA to learn about her ancestry and find out if she might have any half brothers or sisters.

A UK law, passed on April 1 2005, means anyone conceived from a donated sperm, egg, or embryo, can find out the identity of their donor parent once they reach adulthood. But thanks to at-home DNA testing, many donor-conceived people are already uncovering their biological origins, in what can be an emotionally difficult process.

Professor Turi King speaking with Detective Chief Superintendent David Baker (retired), about tracking down double child-murderer Colin Pitchfork. A case that made history for being the first criminal case, in which someone was proven to be innocent, on the basis of genetic evidence. Also, the first time that genetic evidence was used to convict somebody.