Davina McCall and Nicky Campbell present a special edition dedicated to the stories of twins separated at birth. Mary Holmes and Elaine Allin were born just after the Second World War and raised in the same neighbourhood in Chesterfield, but forbidden from seeing each other. It wasn't until they were in their thirties that the sisters were able to find each other - and even then it only happened by chance. There is also a look at the latest scientific research into what it is really like to be separated from a twin at a young age.

In this episode we follow three stories of siblings brought together after decades apart.

Our first story catches up John Nicklin who spent the first 68 years of his life believing he had no biological family. In our second story we catch up with Tracey Collins and Christian Hilton, a brother and sister who reunited in 2014. Our third story follows 81-year-old Pauline Wood as she prepares for her wedding day.

Davina McCall and Nicky Campbell revisit more of the programme's most memorable searches, catching up with two women whose lives have been transformed in ways they never imagined. Those featured are Julie Roberts, who reunited with her birth mother Marion last year - leading to an incredible revelation. The second story follows Christina Barlow as she travels 5,000 miles to Colombia to spend time with the birth parents who gave her up in extreme circumstances, spending time with her full siblings who never knew she existed.