This blog is rated 15 for strong sex references and descriptions of violence.
After years of releasing their annual reports every July, 2018's BBFC annual report was instead released in late May. As I really love testing my BBFC senses on a yearly basis, to see how good I am at reading the general public's perception of what BBFC ratings for films ought to be, I thought I'd guess which films got them the most complaints in 2019!
Note, when I refer to a '2019 release', this actually means any film that came out in cinemas in the UK in 2019. So The Favourite, although a 2018 film by American release dates (and eligible for the 2019 Oscars and BAFTAs for that precise reason), didn't hit UK cinemas until January 2019, and is thus a 'UK 2019 release'.
My guesses:
01. Joker