IOPC Fig leaf.

My local MP was recently very critical of the Metropolitan Police because of the way they treated her son. This treatment seems to involve asking him for ID. When it comes to holding Merseyside Police and the IOPC to account for their treatment of other people over many years, she or at least her staff, seem far less interested in getting involved.
MPs of all persuasions want to court the Law and Order lobby or at least not get the Daily Mail on their case, and as such, they simply ignore most complaints. The same is true of Police & Crime Commissioners, when it comes to taking on the bullies, liars and thugs that inhabit police forces MPs will only get involved if the complainant already has a lot of public backing.
This MP and her staff are "of the left" loudly labelled SJW by the right. In reality like most MPs, they are preoccupied with their own interests; the top one is staying elected.
Some of her supporters like to claim we live in a police state when their protests are shut down. One, a former deputy PCC, Ann O'Byrne, tried to reestablish her credibility by getting herself removed for obstruction and then complaining about being manhandled. In reality, what she got was proportionate and the kind of things she had happily supported when a PCC. O'Bryne isn't the brightest or the most credible of councillors, but she is typical.
We don't live in a police state that would require the police to be acting on the arbitrary instructions of government ministers. What we are seeing is the police as a gang running a protection racket. The elected won't dig too deep into the Polices's internal wall of silence and coverups, and the Police & its militant wing, the Police Federation, will not stir up the Law & Order Lobby.
The Law & Order Lobby, a phrase Jane Kennedy doesn't understand, is mostly right-wing Tory voting, so it is harder to stir it up against a Tory government, which is why they get away with cutting police numbers. The Tories, of course, are fans of the short sharp shock and clip around the ear; in short, they quite like police brutality.
The far left of the Labour party is more interested in their ideology and will only talk about the police when it fits those grand overarching plans, plans, no space for sensible considered practical reform here.
The centre-left, the area I come from, is too worried by the reaction of the law and order lobby and its Daily Mail publicists to do anything; they definitely wouldn't put it in a manifesto.