From the Born in Bradford Study:
"The core finding is confirmation that consanguineous marriage is a major risk factor for CAs, even after adjustment for deprivation."
borninbradford.nhs.uk/our-impacts/publications/cousin-marriage-and-congenital-anomalies-in-a-multiethnic-birth-cohort/
CA = Congenital Abnormality. Congenital abnormalities (CAs) cause stillbirths, infant deaths and many later life disabilities.
Today, many British Pakistani women will have given birth to babies with severe birth defects. This will be as a direct result of her being in an arranged (often forced) marriage to her cousin. Because of repeated first cousin marriage their genetic similarities will be more comparable to being brother and sister.
If she had freely chosen to marry a wholly unrelated man, her baby would - almost certainly - have been healthy. All that heartbreak could have been avoided. And she would have married someone of her own choice, hopefully a man she loves.
Why would anyone oppose legislation?
Education has been tried and failed. It doesn't work. It needs to be combined with severe legal consequences in order to change minds and behaviours. And to protect future children.
A change in the law would make a very clear public statement that cousin marriage is wrong, both legally as well as morally. The law should include punishments such as heavy fines or even prison for those clerics who still carry out illegal marriages between cousins.
We don't marry our cousins in the UK in the 21st century. It's incestuous and, so often, horribly damaging for the resulting children. It must stop.