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Sorry, don't understand (and sure you know): each borough has it's own control over the met for that borough?

Each borough has a borough police force, but they are of course firmly part of the Metropolitan Police. Borough forces often help out across borough boundaries.

Wouldn't that mean that political parties which won the local elections have control over the police in that area?

No, it means that of course the police work closely together with local politicians.

Just on Thursday I was talking to a Hackney police officer I know who had just joined the Hackney Central Safer Neighbourhoods Team (the ward where a lot of today's disturbance has been centred). I can't imagine how she must be feeling--or the local councillors and other people working to improve the place.