There is no one truth - it all depends on your perspective, as PS knows very well.
I used to think that all doctors had to be left-wing, and teachers too, because that was the nature of their jobs. However, not any more.
The BBC is forever getting slated for being biased one way or another. I thought Panorama's recent coverage of the Health Changes was unfair - too pro-government - just in the language they used and the people they invited to participate.
I think it's very likely that the BBC is becoming more right-wing, and that would be because it is clinging on to its license fee and needs to curry favour with the Condems. Also, the more highly it pays its presenters and executives, the more likely they are to have right-wing views.
However, we need to be very careful when we criticise the BBC. Some of its programmes are second to none imo, and I would hate to see it disappear. We would find the replacements nowhere near as good.