As someone who works at the BBC on a regular basis, Auntie has many flaws, but it is not institutionally biased. Nick Robinson, the chief political reporter in this year's election, is a former Young Conservative leader, Nigel Farage has appeared on Question Time more than any other politician in the last five years, Jeremy Paxman did apply once to be the editor of Labour supporting The New Statesman.
It appears to me, that whatever your political leanings, giving the BBC a kicking seems to be the in thing from all areas of the political spectrum precisely because it is independent, unlike the Express, from which you take your article.
Is it 'liberal' in the sense that is supports the arts, women, minorities and so on. Absolutely. Does it screw up on occasions? Yes it does, the Newsnight Jimmy Savile issue is a prime example of a producer flexing their muscles when they should not have done so. The BBC is also pretty fair in being willing to give a right of reply, unlike many of its print based critics.
The BBC is an easy target, it's funding is a historical anachronism, but it does still attempt to apply the Reithian edict of 'Inform, Educate and Entertain' to a far greater degree than any other broadcaster IMO, unless you think that someone else does a better job?
Fair enough although working for them on a regular basis you would possibly defend them. We will see in the run up to the referendum whether the BBC is unbiased.