Take the whole Trump cheating on his wife with a porn star and now a Penthouse Pet of the year. His voter base has barely blinked.
Personally I think Trump knows exactly what he is doing when he says and does certain things that cause his political opponents to waste their time and energy being outraged.
He's controlling the news cycle and the media is playing right into it.
If the London metro police chief cheats on his wife that is one thing. If he plots to use his power granted to him by the public to oppress someone, anyone, that is very bad.
As for the UK, I have no idea how it can reform, or even if it can, its institutionalised propensity for corruption. The only way freedom and rights are wrestled out of the hands of the state is through willingness to die for it. Catalan is a great recent example, collectively there is a want for succession from the Spanish crown, but an unwillingness to die for it... and that is precisely why I don't think they will ever get it.
Similarly, I don't see the British public at large rising up... they are too placated and do not the means to do so. It might seem shocking but in the UK there is no right to freedom of speech.