Big Finish have been clear, http://www.bigfinish.com/podcasts/popout/doctor-who-merry-christmas-and-a-happy-new-year-december-2012-7
I don't see anyone making a real argument against that. Lots of reasons why people would like it to be here but I can't see one shred of evidence pointing to the fact that it should be here. Show me one case where any of the principles have said, "It's in the DWU". One. Has anyone ever claimed that? The fact it might be doesn't make it so. And that's a mighty slim to non-existent "might".
Why does making it a spin-off make it DWU??? All this debate about spin-off status is specious. Is "Unbound" cannon now? In the DWU? Does being a spin-off have anything to do with those questions?
This is a very disappointing debate. Dr. Who uses Lovecraftian characters all the time. Does that put Dr. Who in the Lovecraft universe? Really. A cameo by a Pakhar supercedes what the producer says? Give me a break.