The BBC DG admitted that yes, surprise surprise, the BBC was full of left wingers and despite their best attempts to be balanced, they couldn't. they haven't changed since then by all accounts.
2010 http://www.telegraph.co.uk/culture/tvan ... mpson.html
You only have to look at the last decade of reporting where the balance tends towards the 'business bad - employees always good' angle and in every dispute its about the people wanting more and never about the survival of their employer longer term. It has however changed tone over the last few quarters, with a lot more 'our businesses are actually very good' programmes. Polls show 76% of the populations support a £26k benefit cap (60% support even lower!) but the BBC plays the left wing angle of why its unfair to Somalis living in Knightsbridge. They rarely report the side of people paying more taxes to support the lifestyle of non-workers.
They still noticeably however 'promote' news on public sector disputes and protests and almost never provide a counterbalance on the lack of support the protest get from the majority of UK workers. Given the lack of support from the public at large, public sector strikes should be a footnote on the news - not the main item.
The BBC has also been quite fairly criticised for providing undue publicity and a voice to fringe views, in a manner which is out of proportion to the level of support of the fringe view. The recent example was the recent MMR vaccine situation where they continued to give the same airtime to the banned Doctor and to the medical consensus when fair balance' would be 99% of the airtime being the latter with a brief statement to say 'Doctor X believes otherwise but nobody else thinks he is sane'. Even when the doctor was disbarred, the BBC continued to give equal prominence to his views despite them being utterly refuted.
In attempt to provide balance, the BBC shows its bias in giving its own minority beliefs/politics more prominence than they deserve.
But I would still pay for the BBC for the good programming output of entertainment and drama etc. Given the choice I would cut back much of its overseas reporting, cut back the soaps and game shows and concentrate on its strengths.