https://www.dailymail.co.uk/news/article-10373181/Tory-anger...
https://www.independent.co.uk/news/uk/politics/over-70-mps-w...
https://www.express.co.uk/news/uk/1559812/BBC-bias-Brexit-To...
https://www.express.co.uk/news/politics/1527642/bbc-bias-cha...
https://www.spectator.co.uk/article/watch-tory-mp-accuses-bb...
https://www.chroniclelive.co.uk/news/north-east-news/conserv...
https://www.thesun.co.uk/news/8133800/tory-ministers-bbc-bia...
https://www.huffingtonpost.co.uk/entry/bbc-bias-open-letter-...
https://www.digitalspy.com/media/a339323/tory-mp-criticises-...
Also, those are mostly examples of a hand-full of famously fringe hard-Brexit MPs, over almost 7 years now, that cry foul for anything. Even the 70 MPs open letter said:
"Some of the signatories of this letter shared many of the concerns about the economic impact of Brexit, but all are delighted to find forecasts of immediate economic harm were at best misplaced. So-called ‘despite Brexit’ reporting may be expected of a partisan press, but licence fee-payers have the right to expect better."
This is a vague as possible.
Interestingly, the heavy scrutiny only came after the govt's threat of "defunding" the BBC in 2021. It was never there for the 2019 election, for instance or the Brexit referendum.
Also, the Tory party never accused the BBC of political bias, but rather "wokeness", so this is just an attempt to shift to the public debate to "culture wars", rather than other issues, in my view.