You mean the UK
It may be voluntarily (for now....) but it works the same way a law does by people subjecting themselves
Source: https://en.wikipedia.org/wiki/Islamic_Sharia_Council
Lol oh those. They don't hold any power legally there's nothing they can do to enforce it
Muslamics use them for their marriages, you see the males trick the women into only doing islamic marriages so they're married Islamically but not in the eyes of the state. That way she's effectively signing away any rights a legitime marriage would grant her. She can't get divorce without permission of the Sharia courts and they're heavily skewed and biased imo
A lot of fuss has been made about them recently, soon we might see them become illegal
