Is this correct?
"the Supreme Court has very wide-ranging powers to create new law "
Before the creation of the Supreme Court the Law Lords did not have power to create law, only interpret it as the Court of Final Appeal. A fundamental part of our constitution is separation of Legislature, Executive and Judiciary.
If the quote above is indeed correct it means that unelected, indeed politically appointed individuals, have the right to make law independently of Parliament. That sounds anti-constitutional to me.