The societal damage caused by sharia law can be witnessed today in the story of the Muslim man who forced his 16 year old son to marry and then rape a twelve year old girl - who was also his cousin.
This kind of thing demonstrates the contempt that some Muslims in Britain (about forty per cent, perhaps?) have for British law. "The 54-year-old organised a sham Muslim ceremony between his son, then 16, and the girl at his home in Woolwich, south-east London, in March last year." He knew that the ceremony was illegal under British law. But he didn't care.
Lest anyone think his act was un-Islamic, he was simply following the example of the "Prophet" Muhammad, who "married Aisha when she was a girl of six years of age, and he consummated that marriage when she was nine years old.” (Bukhari v.5, b.58, no.234, and many others) Muhammad is, according to the Qur'an, "a beautiful pattern of conduct" (33:21) who Muslims should strive to emulate in all aspects of their lives. And this is the result.
It should be obvious that all the while Britain's at least 85 sharia courts are left open (many of which are already sanctioning illegal acts), there is a danger that incidents like this will be repeated in a more formal setting. The only solution is to shut them all down. But the government won't do that. It would be "Islamophobia".
Little girls be damned.