One of the reasons the Brexiters - who are still in Government - openly stated for Leaving the EU was so that they could leave the European Convention Of Human Rights, since being a signatory of that Convention is a requirement of EU membership.
The British “elites” are very much not believers in the riff-raff having Rights that superceed their mechanisms for controlling the masses if there is an ultimate genuinelly independent enforcer of those Rights (such as the European Court of Human Rights) - the most favored control mechanisms in the UK have an appearence of fairness whilst being de facto designed for operating differently or being easy to subvert, so a trully independent Human Rights mechanism whose judges didn’t went to the same very expensive and very select private schools as the English power elites is borderline unnacceptable (clearly in the case of Brexiter leaders, absolutelly so) for said power elites.
PS: All this to say that in Britain the problem is a lot deeper than merelly the police, who to a large extent are just hired enforcers in a system designed to “keep people in their place”, a mindset probably derived from the horror of the British Elites at what happenned next door in France during the Revolution Française (the political British system is one of the ones in Europe whoch has change the least for over a century).