A gay couple work as police officers are celebrating the birth of their son after one of the men’s sisters volunteered as their surrogate.

According to the Sun, special constable Steven Ponder, 28, and constable Ivan Sigston, 48, who live in Southampton, welcomed William Campbell Ponder-Sigston into the world last month.

Ponder’s sister Lorna Bradbury, 31, offered to carry the baby for the pair when Ponder revealed he wanted to start a family. She gave birth at her home in Worthing, Sussex.

Although Sigston is the biological father of the child, they must formally adopt William as only the mother’s name appears on the birth certificate.

A friend told the newspaper: “They are over the moon and they cannot thank Lorna enough for what she has done.

“They have decorated a room at their home in blue as a nursery and take William out with the dogs daily.

“I am sure many people will not approve but this was an arrangement between three consenting adults – and William will be brought up with much love.”

The friend added that Bradbury had not been paid for carrying the baby.

The couple have declined to comment.