The Odum of Ala Igbo
Hail Biafra!
Your fear is Sharia law being the national law of Britain. You don't really care if some Muslims wish to practice Sharia law in regards to marriage/divorce. It won't become the national law. Moreover, if Sharia is practiced in regard to court or divorce decisions in Britain - it's not a huge deal. Even if it wasn't formalized, it would be conventionally used putting women at greater risk given the problems of sharia law regarding gender inequality.