BBC’s perception of referendum wrongdoing

Carole Cadwalladr tweets:

No Fiona Bruce!! She just intervened after a woman referred to Leave’s “dirty campaign” & said there are “questions about both sides in the referendum”. Totally untrue. There are multiple legal investigations into Vote Leave, BeLeave, LeaveEU and Arron Banks. And none into Remain

Fiona Bruce’s approach makes #bbcqt so much more watchable than before…so it’s just incredibly sad that one of the @BBC’s top political presenters has zero idea about any of the referendum illegality. A bleak reflection presumably of @bbc’s wholly inadequate coverage of it

Who is in charge of the BBC guidelines?