Diving into that article, it looks like the Scottish move which correlates best with the reduction (and has the best evidence elsewhere) was a proactive gang in

Diving into that article, it looks like the Scottish move which correlates best with the reduction (and has the best evidence elsewhere) was a proactive gang intervention-and-redirection program. Basically, <0.5% of the population is usually doing >50% of the murders, so work with them to prevent murders instead of trying to blanket the city with cops. In Glasgow, that targeted about 3,000 people, and reached enough that even non-participants were affected by reduced revenge violence. In London, that would be about 40,000 people.... The program has been tried in bigger cities, but none larger than half London, and it looks like the effect broadly weakens as population grows. (Among other things, people who refuse to participate are only helped if enough people are reached to intervene in reciprocal violence.) That doesn't mean the intervention wouldn't help, but between costs and very weak starting trust, its hard to imagine the Met actually doing it.