It's just Brexit. The rest will not be allowed to be tried. And Brexit was popular precisely because it located the failed institutions outside the country where they could be a convenient scapegoat, without having to look at the big failing institution: the media-intelligensia-Tory circle of people.
Institutional failure reached the point of allowing Liz Truss to be PM, the UK's shortest PM term at 45 days. The sort of governmental turnover that you'd expect from Italy in the 90s.
(Where's the air disaster type writeup of "how did the Truss failure occur?" in the media? You won't see that because it implicates too many people. Yet it was the organisational equivalent of handing control to an untrained junior who immediately flew the plane into the ground.)