The UK has the principal of "policing by consent".
This has become particularly relevant recently as The Metropolitan Police have become embroiled in multiple corruption scandals.
So my question is thus, does the principal have any meaningful legal weight? If it does, by what process could a particular community (as obviously it couldn't be a thing on a per-individual basis), for example London, withdraw its consent to be policed by The Met?
I suspect, as with most things in British Law, this is a principal only that falls apart as soon as anyone "bound" by it simply decides they don't want to (see the Sewel Convention and Brexit). I just don't have the legal background to verify this.