This is the full text of the letter sent by backbencher Pat McFadden and several other Labour MPs to Tony Hall, director-general of the BBC.
Dear Lord Hall
The BBC is a world renowned and globally respected broadcaster. Its reputation is based on fearless fact based impartial reporting.
The BBC and our broadcasters (unlike newspapers) are required to be objective and impartial by law. The BBC rightly guards its independence and should resist attempts at political interference or pressure.
This is particularly important in today’s political environment where self-reinforcing social media bubbles and authoritarian attempts to force people to accept a single version of events are on the rise.
We expect the BBC to defend its independence and report impartially, robustly and fearlessly on all issues relating to Brexit and not succumb to any pressure to skew its coverage one way or the other.
Lord (Michael) Cashman