John Bercow has been revealed as being anti Brexit, anti President Donald Trump and pro immigration, something tells me that the BBC will definitely not be saying that he's not impartial.
Imagine that the House of Commons speaker had been revealed as being pro Brexit, pro President Donald Trump and anti unfettered immigration. Something tells me that the BBC would be casting doubts as to his suitability for the impartial role of Speaker.
Remember that the BBC is also meant to be politically impartial, but isn't.
You can read more about the BBC and John Bercow here on the BBC http://www.bbc.co.uk/news/uk-politics-38947257
If you want to know more about John Bercow then Saturday's Times might be of interest... The BBC will definitely not be reporting that piece of news linking John Bercow and Keith Vaz.