The BBC is one of very few respected foreign news outlets that is not routinely blocked by the GFW. They generally have a more China-friendly stance than US news media.
That being said it is trusted a lot more than CCN & Foxnews which are the other two news sources that are on cable TV (neither are blocked at the moment).
I wouldn't really say that the BBC has a China-friendly stance. I would say that it tries to be more objective most of the time (which I agree with when compared to CCN & Fox News).
It sure would be interesting to someday learn about how all these decisions of what to block get made.
Random thought: it would be interesting to compare news services that are and aren't blocked and see if the ones that haven't been blocked yet tend to be more positive on Beijing in their coverage.