I read this article a couple of times, and I'm puzzled what the Times means by "Church of England." The article says that "Tom Butler, Bishop of Southwark" made a submission to the commission. It does not say who the Bishop is speaking for--himself, his colleagues? Nothing is said about a meeting of the bishops, and certainly not a formal Westminster Assembly.
Even if the Archbishop of Canterbury speaks out on some matter, it is not necessarily official Anglican doctrine, although he has more authority than the other bishops.
Not that the Anglican Church isn't riddled with heresy on all sorts of issues. They very easily could come out in favor of baby killing, as well as abortion. But it's possible that this article misinterprets the meaning of the Bishop of Southwerk's submission. Maybe he's just a flaky bishop.