You really ought to inform yourself before you post: https://fullfact.org/law/uks-sharia-courts/
Sharia "courts" in England are called "councils" by the government because their rulings have no force of civil law.  In this respect, they are exactly like various decision-making bodies set up by other religions to govern matters such as marriage and divorce.  That Catholic church, for example, has "marriage tribunals" in Rome and in the U.S. in larger dioceses.  They rule on applications for marriage annulments.  Their decisions bind only parties that appear voluntarily before them, and address only the theological aspect of marriage.  They can neither grant nor forbid a civil divorce.  Orthodox Jews have a similar arrangement--except that in Israel, their tribunals really do control civil marriage and divorce, even for non-religious Jews.  For this reason, many Israeli marriages and civil divorces take place in Cyprus.  The Sharia "courts" are exactly like these other religious bodies.