What do you know? The BBC commissioned an academic to prepare a report on its record as an impartial reporter. He found that it was biased to the right. The report didn't suit so was shelved.
Now the professor has decided to let the public know what the BBC and its government paymasters don't want us to know. So the voice of reaction has had to react. It has done so in the manner those of us who complain about its bias are used to -

“BBC News aims to provide clear, impartial and balanced coverage across all output to represent a range of views. Inevitably, there may be disagreements over the level of prominence given to any story. We are editorially independent and do not bow to pressure from political parties.”

And that's that.
Still the truth will out in time.

"The serious criticism by a distinguished media professor suggests that the BBC has compromised its impartiality by depending too heavily on sources from business, the media, law and order and politics.
By contrast, ITV and Channel 4 make much greater use of sources from academia, medicine, science and non-governmental organisations"

"Cardiff research found that 50 per cent of BBC sources came from politics, business, law and order and media, compared to 10 per cent from the knowledge-based professions and civic groups. Business sources accounted for 11.1 per cent of the total on the BBC, but only 3.8 per cent on ITV and 2.2 on Channel 4."

More here