When a couple get divorced, the court has the power to rearrange their pension provision. This can be done by way of a pension sharing order. The court orders the trustees of the pension scheme to take a percentage of the transfer value of the pension and give it to the other spouse.
What happens next depends on the rules of the pension scheme. Some schemes require the receiving spouse to become a member of that scheme, so that they have a pension of their own within the same scheme. Other schemes require the receiving spouse to transfer their share out into another scheme. Some schemes give the receiving spouse a choice between the two.