“They tend to always produce negative pieces about…” is quite an unevidenced statement. I would think fair journalism would produce negative pieces on a lot of people, and perhaps those where the relationship isn’t going well might stick in the mind more.

More generally though, what’s the game plan here if, as your comment seems to posit, there could be (or could be seen to be) an ulterior motive. UK has left EU. Wants trade partners. Not going as well with India as it could. So make documentary to make it go worse? I’m not sure how this would be the BBC being the puppet of the government.