The character of Sarah Jane Smith has recently appeared in a series of licensed audio adventures by Big Finish. But Davies said that he doesn’t consider those appearances part of the Doctor Who canon. “Nothing we say in The Sarah Jane Adventures will contradict anything that ever happened in the Big Finish stories, but neither will we refer to them, because we’re very different,” Davies said. “Much as I love the Big Finish adventures, it’s a very small and very specific audience, and if we tried to pick up from that, no one would have any idea what we’re on about. Plus, those Sarah Jane stories were very much for adults, and this is a children’s series, and it won’t be shown in the Doctor Who timeslot either; it will be shown earlier. So it’s a brand-new start. It’s written as though if you never heard of Sarah Jane and don’t know what’s going on.”

wonder if those will be considered canon?

http://doctorwho.co.uk/drwho_sarahjane/index.shtml