The Labour Party/Guardian attack the BBC for being pro-Coalition

The Guardian reports with a straight face that:

'The Labour party has made a "serious complaint" to the BBC about a lack of political balance in its news coverage as it attempts to reinvigorate Ed Miliband's leadership and counter what it sees as widespread media bias in favour of the David Cameron-led coalition.'

I cannot believe that the Labour party or The Guardian truly believe this claim, surely even they are not that deluded. So my conclusion is that the Labour party, The Guardian and indeed the BBC have recognised that sites such as Biased BBC, and maybe even this one, are attracting more and more attention to their posts that prove the BBC pro-left bias. Their tactic to fight this idea is to attack from the opposite side, thus the BBC can claim, albeit falsely, that if they are being criticised from the right and the left then they must be being unbiased. This claim is both a logical fallacy and a lie but since when has either of those two mattered to the Labour party, The Guardian or indeed to BBC?