The couple, who were not identified, did not discover the blood relation until after they had been married. It was not revealed exactly how the two came to know each other.

Officials say the siblings were born twins but immediately separated at birth. Each was then adopted by different families but neither was told they had a twin.

Upon the shocking discovery, the couple was granted an annulment by a British judge.

Some believe this case highlights the need for children to know the identity of their biological parents. Professor Lord Alton, who made the discovery, said that new reforms introduced by ministers threaten to undermine the existing rights of children.

Essentially, he believes, that proposed changes in British law would further weaken the link between children and their biological parents.

"There will be more cases like this if children are not given access to the truth," Alton said.