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The Met is responsible for Greater London (where all the riots seem to be so far). The City of London Police is responsible for the Square Mile (the actual City) in the centre.

The City of London police don't especially carry firearms. That said, you may see more of the specially armed police in the City, simply because of a high terrorist threat

The Met is just another regional police force, similar to (and on a level with) the Hampshire or Sussex police. It is only really special because of the size and importance of its area of operations.

ok, thanks for the clarification. I was confusing the The Met with the City of London Police.