John, the BBC news has a right-wing bias. It consistently gives proportionately more air-time to Tories. I can find you studies if you like, but I've shown you those before.
EDIT: Apparently, in the run up to the election, most TV news channels (BBC, Sky, Channel 4 & Channel 5) gave more time to the Tories than to Labour. This disparity was strongest with Channel 4 & Channel 5. ITV was the exception, where Labour got a fraction more time. (
Source: based on study by Cardiff University)