My favourite measure of bias across the Beeb is the super-average interruption coefficient - which is calculated very simply by adding up all the individual I.C.s for each party & then dividing them by the number of interviewed granted to each party that month. As with all statistics, the larger the sample, the better the result - and the more significant any differences (hence the increase of the I.C. to 2 decimal places).
Here is how things worked out in January 2010. Guess who's top again?!
UKIP (5 interviews) - 1.56
DUP (4 interviews) - 1.26
SNP (6 interviews) - 0.95
Conservatives (75 interviews) - 0.91
Sinn Fein (6 interviews) - 0.82
Labour (134 interviews) - 0.61
Greens (2 interviews) - 0.60
Liberal Democrats (44 interviews) - 0.51
Independents (3 interviews) - 0.40
SDLP (2 interviews) - 0.30
TUV (2 interviews) - 0.25
Alliance (1 interview) - 0.00
Respect (1 interview) - 0.00
That very high average for UKIP, based on 6 interviews, leaps out straight off. It's very close to December's figure too (1.55), showing that there's a consistency to the BBC's hostility towards the party. The Democratic Unionist Party, propelled into the headlines by events, comes off second worse. The SNP continue to be ill-treated by the BBC and only slightly behind them come the Conservatives - again, significantly more likely to be interrupted by BBC interviewers than their Labour and Lib Dem counterparts, as shown here month after month after month. Left-wing bias at the BBC? Clearly.