You can't trust the BBC whatsoever since they started trying to compete with commercial media a few years ago. "BREAKING: Iran is evil! UP NEXT: beach babes who like to grow moustaches" Total shitshow
The UK establishment have influence on the stuff that really, really matters. Corbyn is a great example. The BBC accumulate political capital on smaller stuff that is unbiased, then spend that to keep people who want systemic change that impacts vested interests.