> I'm curious, around when do you think that changed?
The smell of change appeared more clearly in the run-up to Brexit. Certainly post-Brexit I would say it is very much evident.
> And was there a specific story they reported on (or didn't report on) that really solidified the change for you?
To be clear (as per my Radio 4 example cited above), it is not necessarily a case of "reported on / did not report on", it is frequently more a case of bias / lack of impartiality, again as nicely exemplified by my "two hardcore Brexiteers fight over Brexit" example[1].
However, I could also give you many examples of "reported on/did not report on". Perhaps one of the most well known is Lady Mone of House of Lords fame. She is/was subject to various investigations regarding supply of PPE during CoVID.
For a long time, Lady Mone's investigations were widely reported in all mainstream media (tabloids, broadsheets, other mainstream TV/Radio news ... you name the place, it was reported there).
But the BBC ? Nope. No mention on TV/Radio news, and for a long time a search for "Mone" on the BBC News website yielded exactly zero results.
Even today although you can now find a small number of mentions on the BBC website, you'll have to go looking on other mainstream sources for the actual detail.[2]
[1] https://www.thenational.scot/news/23289638.bbc-slated-insult...
[2] https://www.thenational.scot/news/20107509.bbc-refuses-say-h...
EDIT TO ADD (because I can't reply to the @Veen directly)
> Leftists think it's an establishment mouthpiece run by the Tories.
Well....
I see how they could feel that way when the recently appointed BBC Chairman is a chap who appears to have more than a few ties to Boris Johnson[3].
[3] https://committees.parliament.uk/committee/378/digital-cultu...