Is 'Is the BBC biased?' biased?

The following message arrived in our inboxes yesterday. We don’t normally do ads, but this new  US site might be of interest. (I see we get a name-check.) We could compare notes.

Dear Craig and Sue,
You and your readers may be interested in the world’s first daily media bias index. Launched this week by CIW NEWS, the index tracks the ideological bias of the BBC using a simple but powerful measure. 

From today, CIW NEWS will calculate its pioneering BBC bias index each evening New York time and post the index’s latest value to its Media Bias Index page.
You can find more information here. 
Yours,
CIW NEWS Team