Surrogacy is a personal journey for the Olympic diver and his husband Dustin Lance Black as they welcomed a child through a surrogate earlier this year, becoming one of the increasing number of parents who have children through surrogacy.

The documentary will also see the diver travel to European countries where surrogacy is completely illegal and across the pond to California, where commercial surrogacy is a common choice for many parents.

Daley will speak to surrogates about why they decide to do it and the relationships they develop with parents, as well as those who oppose surrogacy and their reasons for wanting to keep the commercial surrogacy illegal in the UK.

"Surrogacy is one of the most complex issues in modern society and the laws which govern it are radically different across the world," said BBC Head of Commissioning, Natural History and Specialist Factual, Tom McDonald. 

"As new fathers through surrogacy, Tom and Lance are both committed to exploring all of the nuances around this very emotive subject. I'm thrilled that Tom is going to be our guide in this deeply personal and intelligent film."

The documentary is due to air in 2019.