That's not to say there aren't big problems in the Met - there are. The biggest is that there simply aren't enough police. The UK has fewer police per capita than any European country, and the police nationwide have been struggling ever since the numbers were drastically slashed by Theresa May when she was Home Secretary.
Sure the *funding* comes from the government - but The Mayor of London is the equivalent of the Police and Crime Commissioner and is responsible for the totality of policing in the capital. He is responsible for how various agencies work together to reduce crime.
You’re understating the importance of this position. It’s quite clear there’s a two-tier policing situation going on. He is allowing the Islamic radicals to protest while defacing the city, nothing is done - while the native English are treated to batons and horses any time they wish to protest.
This has nothing to do with how many police there are, although I’ll concede that Theresa May, of the Conservative Party (sigh), holds a significant share of the blame respective to the invasion.